Merge pull request #531 from Homebrew/limit-bottle-downloads

pre-build: download only needed bottles

pre-build/action.yml

@@ -28,6 +28,7 @@ runs:
  shell: /bin/bash -euo pipefail {0}
 
  - name: Set up RubyGems cache
+ id: setup-cache
  shell: /bin/bash -euo pipefail {0}
  run: |
  cache_key_prefix="${{ runner.os }}"
@@ -39,6 +40,8 @@ runs:
  cache_key_prefix="${macos_version}-${arch}"
  fi
  echo "cache_key_prefix=${cache_key_prefix}" >> "$GITHUB_ENV"
+ echo "macos_version=${macos_version}" >> "$GITHUB_OUTPUT"
+ echo "arch=${arch}" >> "$GITHUB_OUTPUT"
 
  - name: Cache Homebrew Bundler RubyGems
  id: cache
@@ -58,17 +61,29 @@ runs:
  shell: /bin/bash -euo pipefail {0}
 
  - name: Set up bottles directory
+ id: setup-bottles
  run: |
  rm -rvf "${BOTTLES_DIR:?}"
  mkdir "${BOTTLES_DIR:?}"
+
+ if [[ "${{ runner.os }}" = Linux ]]; then
+ bottle_specifier="{ubuntu,linux}"
+ else
+ bottle_specifier="$MACOS_VERSION"
+ [[ "$ARCH" = arm64 ]] && bottle_specifier="${bottle_specifier}-${ARCH}"
+ fi
+
+ echo "bottle_specifier=$bottle_specifier" >> "$GITHUB_OUTPUT"
  shell: /bin/bash -euo pipefail {0}
  env:
  BOTTLES_DIR: ${{ inputs.bottles-directory }}
+ MACOS_VERSION: ${{ steps.setup-cache.macos_version }}
+ ARCH: ${{ steps.setup-cache.arch }}
 
  - name: Download bottles from GitHub Actions
  if: fromJson(inputs.download-bottles)
  uses: actions/download-artifact@v4
  with:
- pattern: bottles_*
+ pattern: bottles_${{ steps.setup-bottles.bottle_specifier }}*
  path: ${{ inputs.bottles-directory }}
  merge-multiple: true