perf: use ccache and parallel make, and skip already-built newer-R candidates in bulk (#240)

.crow/build-all-versions.yaml

@@ -140,6 +140,7 @@ steps:
       - ${ARCH}-binaries-r-dep-cache-${OS}-${OS_VERSION//./}:/mnt/cache
     commands:
       - git clone -q https://pat-s:$$REPO_RO_TOKEN@git.devxy.io/devxy/build-cran-binaries.git .
+      - . local/compiler-cache.sh
       - mkdir -p /mnt/cache/uvr/cache /mnt/cache/uvr/packages /mnt/cache/R-pkgs /mnt/cache/ccache /mnt/cache/packages
       # The primary pass must not rely on build-all-versions-install-deps having
       # run on *this* agent: depends_on only orders the steps, but the cache

.crow/process-updates.yaml

@@ -179,6 +179,8 @@ steps:
       R_LIBS_USER: /mnt/cache/R-pkgs
       R_VERSION: ${R_VERSION}
       CCACHE_DIR: /mnt/cache/ccache
+      # parallel make within one package build, matched to the step's CPU limit
+      MAKE_JOBS: 3
       PLATFORM: ${OS}
       OS_ID: ${OS_ID}
       ARCH: ${ARCH}
@@ -186,6 +188,7 @@ steps:
       INTERVAL: lubridate::interval(lubridate::today() - 6, lubridate::today() - 3)
     commands:
       - git clone -q https://pat-s:$$REPO_RO_TOKEN@git.devxy.io/devxy/build-cran-binaries.git .
+      - . local/compiler-cache.sh
       - rm -rf /mnt/cache/R-pkgs/00LOCK-* /mnt/cache/R-pkgs/bincraft
       - mkdir -p /mnt/cache/uvr/cache /mnt/cache/uvr/packages /mnt/cache/R-pkgs /mnt/cache/ccache /mnt/cache/packages
       - /opt/R/$R_VERSION/bin/Rscript local/install-bincraft.R

.crow/weekly-rebuild-missing.yaml

@@ -373,6 +373,8 @@ steps:
       R_LIBS_USER: /mnt/cache/R-pkgs
       R_VERSION: ${R_VERSION}
       CCACHE_DIR: /mnt/cache/ccache
+      # parallel make within one package build, matched to the step's CPU limit
+      MAKE_JOBS: 3
       PLATFORM: ${OS}
       ARCH: ${ARCH}
       NCPUS: 2
@@ -384,6 +386,7 @@ steps:
       REBUILD_BUDGET_HOURS: 20
     commands:
       - git clone -q https://pat-s:$$REPO_RO_TOKEN@git.devxy.io/devxy/build-cran-binaries.git .
+      - . local/compiler-cache.sh
       - mkdir -p /mnt/cache/uvr/cache /mnt/cache/uvr/packages /mnt/cache/R-pkgs /mnt/cache/ccache /mnt/cache/packages
       - rm -rf /mnt/cache/R-pkgs/00LOCK-*
       - /opt/R/$R_VERSION/bin/Rscript local/install-bincraft.R