refactor(ci): route workflows by agent group label instead of named agent (#94)

## Summary

- Switch crow workflow placement from a per-agent label (`agent: ${AGENT}`) to a group label (`group: rpkgs-${ARCH}`), so jobs target the `rpkgs-amd64` / `rpkgs-arm64` agent pools instead of a single named agent (`artemis`/`gaia`).
- Remove the now-unused `AGENT` matrix variable from all build/process/weekly workflows.
- Update header comments to reflect group-based placement.

Agents opt into a pool via `CROW_AGENT_LABELS="group=rpkgs-<arch>"`. The group name derives from each matrix row's `ARCH`, so adding or replacing agents no longer requires touching the workflow files.

Reviewed-on: #94

.crow/build-all-versions-install-deps.yaml

@@ -30,14 +30,12 @@ skip_clone: true
 
 labels:
   platform: linux/${ARCH}
-  agent: ${AGENT}
+  group: rpkgs-${ARCH}
 
 matrix:
   include:
     - ARCH: amd64
-      AGENT: artemis
     - ARCH: arm64
-      AGENT: gaia
 
 steps:
   - name: 'Install deps and bincraft'

.crow/build-all-versions.yaml

@@ -1,7 +1,7 @@
 ### Manual full rebuild of all CRAN binaries for one OS/arch.
 # Set the variables below in the manual-run form (or via --var on the CLI).
 # `target_arch` routes the matrix; OS/OS_VERSION/R_VERSION select the platform
-# image and cache volume. Placement is via the agent label (artemis/gaia).
+# image and cache volume. Placement is via the group label (rpkgs-amd64/rpkgs-arm64).
 # Skip list lives in local/excluded-packages.json (read by local/build-all.R).
 variables:
   target_arch:
@@ -31,47 +31,39 @@ skip_clone: true
 
 labels:
   platform: linux/${ARCH}
-  agent: ${AGENT}
+  group: rpkgs-${ARCH}
 
 matrix:
   include:
     - ARCH: amd64
-      AGENT: artemis
       R_PKG_CACHE_DIR: ''
       SPLIT_INTO: 4
       SPLIT_INDEX: 1
     - ARCH: amd64
-      AGENT: artemis
       R_PKG_CACHE_DIR: ''
       SPLIT_INTO: 4
       SPLIT_INDEX: 2
     - ARCH: amd64
-      AGENT: artemis
       R_PKG_CACHE_DIR: ''
       SPLIT_INTO: 4
       SPLIT_INDEX: 3
     - ARCH: amd64
-      AGENT: artemis
       R_PKG_CACHE_DIR: ''
       SPLIT_INTO: 4
       SPLIT_INDEX: 4
     - ARCH: arm64
-      AGENT: gaia
       R_PKG_CACHE_DIR: /mnt/cache/pkgcache
       SPLIT_INTO: 4
       SPLIT_INDEX: 1
     - ARCH: arm64
-      AGENT: gaia
       R_PKG_CACHE_DIR: /mnt/cache/pkgcache
       SPLIT_INTO: 4
       SPLIT_INDEX: 2
     - ARCH: arm64
-      AGENT: gaia
       R_PKG_CACHE_DIR: /mnt/cache/pkgcache
       SPLIT_INTO: 4
       SPLIT_INDEX: 3
     - ARCH: arm64
-      AGENT: gaia
       R_PKG_CACHE_DIR: /mnt/cache/pkgcache
       SPLIT_INTO: 4
       SPLIT_INDEX: 4

.crow/process-updates.yaml

@@ -5,7 +5,7 @@
 #             its matching matrix row (via the per-row `cron:` name filter).
 #   - manual: pick a target from the `process_cran_updates` dropdown
 #             ("all" = every os/arch).
-# Arch placement is handled by the agent label (artemis=amd64, gaia=arm64).
+# Arch placement is handled by the group label (rpkgs-amd64, rpkgs-arm64).
 variables:
   process_cran_updates:
     description: "Manual run target: a specific <os>-<arch>, or 'all' for every os/arch."
@@ -36,104 +36,90 @@ when:
 skip_clone: true
 
 labels:
-  agent: ${AGENT}
+  group: rpkgs-${ARCH}
 
 matrix:
   include:
     - OS: alpine-322
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: alpine:3.24
       OS_ID: alpine322
       PROCESS_NEW: "FALSE"
     - OS: alpine-322
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: alpine:3.24
       OS_ID: alpine322
       PROCESS_NEW: "FALSE"
     - OS: alpine-323
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: alpine:3.24
       OS_ID: alpine323
       PROCESS_NEW: "FALSE"
     - OS: alpine-323
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: alpine:3.24
       OS_ID: alpine323
       PROCESS_NEW: "FALSE"
     - OS: redhat-8
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: redhat:8
       OS_ID: rhel8
       PROCESS_NEW: "TRUE"
     - OS: redhat-8
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: redhat:8
       OS_ID: rhel8
       PROCESS_NEW: "TRUE"
     - OS: redhat-9
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: redhat:9
       OS_ID: rhel9
       PROCESS_NEW: "TRUE"
     - OS: redhat-9
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: redhat:9
       OS_ID: rhel9
       PROCESS_NEW: "TRUE"
     - OS: redhat-10
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: redhat:10
       OS_ID: rhel10
       PROCESS_NEW: "TRUE"
     - OS: redhat-10
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: redhat:10
       OS_ID: rhel10
       PROCESS_NEW: "TRUE"
     - OS: ubuntu-2204
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: ubuntu:jammy
       OS_ID: jammy
       PROCESS_NEW: "TRUE"
     - OS: ubuntu-2204
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: ubuntu:jammy
       OS_ID: jammy
       PROCESS_NEW: "TRUE"
     - OS: ubuntu-2404
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: ubuntu:noble
       OS_ID: noble
       PROCESS_NEW: "TRUE"
     - OS: ubuntu-2404
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: ubuntu:noble
       OS_ID: noble

.crow/weekly-audit-missing.yaml

@@ -5,7 +5,7 @@
 #             its matching matrix row (via the per-row `cron:` name filter).
 #   - manual: pick a target from the `weekly_audit_missing` dropdown
 #             ("all" = every os/arch).
-# Arch placement is via the agent label (artemis=amd64, gaia=arm64).
+# Arch placement is via the group label (rpkgs-amd64, rpkgs-arm64).
 variables:
   weekly_audit_missing:
     description: "Manual run target: a specific <os>-<arch>, or 'all' for every os/arch."
@@ -38,88 +38,72 @@ when:
 skip_clone: true
 
 labels:
-  agent: ${AGENT}
+  group: rpkgs-${ARCH}
 
 matrix:
   include:
     - OS: alpine-321
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: alpine-321
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: alpine-322
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: alpine-322
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: alpine-323
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: alpine-323
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: redhat-8
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: redhat:8
     - OS: redhat-8
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: redhat:8
     - OS: redhat-9
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: redhat:9
     - OS: redhat-9
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: redhat:9
     - OS: redhat-10
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: redhat:10
     - OS: redhat-10
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: redhat:10
     - OS: ubuntu-2204
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: ubuntu:jammy
     - OS: ubuntu-2204
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: ubuntu:jammy
     - OS: ubuntu-2404
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: ubuntu:noble
     - OS: ubuntu-2404
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: ubuntu:noble
 

.crow/weekly-rebuild-missing.yaml

@@ -6,7 +6,7 @@
 #   - manual: `weekly_rebuild_missing` dropdown, default "all" (matches the
 #             previous bare manual trigger that ran every os/arch); pick a
 #             single <os>-<arch> to run just one.
-# Arch placement is handled by the agent label (artemis=amd64, gaia=arm64).
+# Arch placement is handled by the group label (rpkgs-amd64, rpkgs-arm64).
 variables:
   weekly_rebuild_missing:
     description: "Manual run target: a specific <os>-<arch>, or 'all' for every os/arch."
@@ -37,78 +37,64 @@ when:
 skip_clone: true
 
 labels:
-  agent: ${AGENT}
+  group: rpkgs-${ARCH}
 
 matrix:
   include:
     - OS: alpine-322
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: alpine-322
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: alpine-323
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: alpine-323
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: alpine:3.24
     - OS: redhat-8
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: redhat:8
     - OS: redhat-8
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: redhat:8
     - OS: redhat-9
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: redhat:9
     - OS: redhat-9
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: redhat:9
     - OS: redhat-10
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.5.3
       IMG: redhat:10
     - OS: redhat-10
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.5.3
       IMG: redhat:10
     - OS: ubuntu-2204
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: ubuntu:jammy
     - OS: ubuntu-2204
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: ubuntu:jammy
     - OS: ubuntu-2404
       ARCH: amd64
-      AGENT: artemis
       R_VERSION: 4.4.3
       IMG: ubuntu:noble
     - OS: ubuntu-2404
       ARCH: arm64
-      AGENT: gaia
       R_VERSION: 4.4.3
       IMG: ubuntu:noble