refactor(ci): consolidate build-all-versions workflows (4 -> 2 files)

Merge the per-arch build-all and install-deps files into one each:
  build-all-versions-{amd64,arm64}.yaml             -> build-all-versions.yaml
  build-all-versions-install-deps-{amd64,arch}.yaml -> build-all-versions-install-deps.yaml

Arch becomes a matrix axis carrying the per-arch agent (artemis/gaia),
BACKEND (kubernetes/docker) and R_PKG_CACHE_DIR. Routing is unchanged: the
existing `task == "build-all-${ARCH}"` selector means
`--var task=build-all-amd64` still runs only the amd64 rows. OS / OS_VERSION /
R_VERSION / K8S_INSTANCE_TYPE are still passed via --var. These pipelines are
manual-only (no cron).

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

@@ -1,11 +1,23 @@
+# Consolidated install-deps for build-all (both arches in one file).
+# Arch is a matrix axis; the existing task selector still routes it:
+#   task == "build-all-amd64" runs the amd64 row, "build-all-arm64" the arm64 row.
+# OS / OS_VERSION / R_VERSION / K8S_INSTANCE_TYPE are still passed via --var.
 when:
   - event: manual
-    evaluate: 'task == "build-all-arm64"'
+    evaluate: 'task == "build-all-${ARCH}"'
 
 skip_clone: true
 
 labels:
-  agent: gaia
+  platform: linux/${ARCH}
+  agent: ${AGENT}
+
+matrix:
+  include:
+    - ARCH: amd64
+      AGENT: artemis
+    - ARCH: arm64
+      AGENT: gaia
 
 steps:
   - name: 'Install deps and bincraft'

.crow/build-all-versions.yaml

@@ -1,39 +1,72 @@
-### Required extra vars
-# ARCH (amd64)
-# OS (alpine)
-# OS_VERSION (3.22)
-# R_VERSION (4.5.3)
-# crow pipeline create --var ARCH=amd64 --var OS=alpine --var OS_VERSION=3.24 --var R_VERSION=4.5.3 --var task=build-all-amd64 --branch=main --log-level=info 5
+### Required extra vars (passed via --var at manual trigger time)
+# OS (alpine) / OS_VERSION (3.22) / R_VERSION (4.5.3) / K8S_INSTANCE_TYPE (amd64)
+# Arch is selected by the task name and routed via the matrix:
+#   crow pipeline create --var task=build-all-amd64 --var OS=alpine --var OS_VERSION=3.24 --var R_VERSION=4.5.3 --var K8S_INSTANCE_TYPE=... --branch=main 5
+#   crow pipeline create --var task=build-all-arm64 --var OS=alpine --var OS_VERSION=3.24 --var R_VERSION=4.5.3 --branch=main 5
+# Skip list lives in local/excluded-packages.json (read by local/build-all.R).
 when:
   - event: manual
-    evaluate: 'task == "build-all-amd64"'
+    evaluate: 'task == "build-all-${ARCH}"'
 
 skip_clone: true
 
 labels:
-  platform: linux/amd64
-  agent: artemis
+  platform: linux/${ARCH}
+  agent: ${AGENT}
 
 matrix:
   include:
-    - SPLIT_INTO: 4
+    - ARCH: amd64
+      AGENT: artemis
+      BACKEND: kubernetes
+      R_PKG_CACHE_DIR: ''
+      SPLIT_INTO: 4
       SPLIT_INDEX: 1
+    - ARCH: amd64
+      AGENT: artemis
       BACKEND: kubernetes
-    - SPLIT_INTO: 4
+      R_PKG_CACHE_DIR: ''
+      SPLIT_INTO: 4
       SPLIT_INDEX: 2
+    - ARCH: amd64
+      AGENT: artemis
       BACKEND: kubernetes
-    - SPLIT_INTO: 4
+      R_PKG_CACHE_DIR: ''
+      SPLIT_INTO: 4
       SPLIT_INDEX: 3
+    - ARCH: amd64
+      AGENT: artemis
       BACKEND: kubernetes
-    - SPLIT_INTO: 4
+      R_PKG_CACHE_DIR: ''
+      SPLIT_INTO: 4
+      SPLIT_INDEX: 4
+    - ARCH: arm64
+      AGENT: gaia
+      BACKEND: docker
+      R_PKG_CACHE_DIR: /mnt/cache/pkgcache
+      SPLIT_INTO: 4
+      SPLIT_INDEX: 1
+    - ARCH: arm64
+      AGENT: gaia
+      BACKEND: docker
+      R_PKG_CACHE_DIR: /mnt/cache/pkgcache
+      SPLIT_INTO: 4
+      SPLIT_INDEX: 2
+    - ARCH: arm64
+      AGENT: gaia
+      BACKEND: docker
+      R_PKG_CACHE_DIR: /mnt/cache/pkgcache
+      SPLIT_INTO: 4
+      SPLIT_INDEX: 3
+    - ARCH: arm64
+      AGENT: gaia
+      BACKEND: docker
+      R_PKG_CACHE_DIR: /mnt/cache/pkgcache
+      SPLIT_INTO: 4
       SPLIT_INDEX: 4
-      BACKEND: kubernetes
-    # - SPLIT_INTO: 4
-    #   SPLIT_INDEX: 5
-    #   BACKEND: kubernetes
 
 depends_on:
-  - build-all-versions-install-deps-amd64
+  - build-all-versions-install-deps
 
 steps:
   - name: 'Build binaries'
@@ -55,7 +88,7 @@ steps:
       # normal env vars
       GIT_USER: pat-s
       # set the location of the 'pkgcache' cache dir which persists the R package dependencies needed to install the packages themselves
-      R_PKG_CACHE_DIR: ''
+      R_PKG_CACHE_DIR: ${R_PKG_CACHE_DIR}
       R_LIBS_USER: /mnt/cache/R-pkgs
       CCACHE_DIR: /mnt/cache/ccache
       NCPUS: 2
@@ -64,8 +97,6 @@ steps:
     commands:
       - git clone -q https://pat-s:$$REPO_RO_TOKEN@git.devxy.io/devxy/build-cran-binaries.git .
       - mkdir -p /mnt/cache/pkgcache /mnt/cache/R-pkgs /mnt/cache/ccache /mnt/cache/packages
-      # Windows-only: 'RInno', 'KeyboardSimulator', 'R2PPT', 'RWinEdt', 'blatr', 'excel.link', 'spectrino', 'taskscheduleR', 'MDSGUI', 'BiplotGUI', 'R2wd', 'rFUSION', 'MediaNews', 'rFUSION', 'MediaNews'
-      # pkgs = readRDS('/mnt/cache/pkgs_amd64.rds');
       - XVFB=$(command -v xwfb-run 2>/dev/null || command -v xvfb-run); XVFB_ARGS=""; if command -v xwfb-run >/dev/null 2>&1; then dnf install -y -q weston 2>/dev/null; XVFB_ARGS="-c weston"; fi
       - $XVFB $XVFB_ARGS -n $SPLIT_INDEX -- /opt/R/$R_VERSION/bin/Rscript local/build-all.R $SPLIT_INTO $SPLIT_INDEX $NCPUS 2>&1
       - |