feat: allow users to control strategy.matrix.exclude (#6)

* feat: allow users to control strategy.matrix.exclude

* Update bazel.yaml

.github/workflows/bazel.yaml

@@ -15,11 +15,29 @@ on:
  # JSON is needed because list is not supported:
  # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#onworkflow_callinputsinput_idtype
  description: |
- JSON-formatted array of folders to run 'bazel test' in
+ JSON-formatted array of folders to run 'bazel test' in.
  For example, '[".", "e2e/smoke"]'
  type: string
+ exclude:
+ description: |
+ JSON-formatted array of exclusions to the generated matrix of tests.
+
+ By default, we don't test bzlmod with Bazel 5 (not supported)
+ and we don't test non-linux with Bazel 5 to minimize macOS and Windows minutes
+ since they are billed at 10X and 2X respectively:
+ https://docs.github.com/en/billing/managing-billing-for-github-actions/about-billing-for-github-actions#included-storage-and-minutes
+ 
+ Note: independent of this setting, we don't create MacOS/Windows matrix entries for pull requests
+ unless they come from a specially-named branch. See logic below.
+ type: string
+ default: |
+ [
+ {"bazelversion": "5.4.0", "bzlmodEnabled": true},
+ {"bazelversion": "5.4.0", "os": "macos-latest"},
+ {"bazelversion": "5.4.0", "os": "windows-latest"}
+ ]
  exclude_windows:
- description: Don't run tests on Windows
+ description: Don't run any tests on Windows
  type: boolean
 
 jobs:
@@ -54,7 +72,7 @@ jobs:
  - id: bazel_from_bazelversion
  run: echo "bazelversion=$(head -n 1 .bazelversion)" >> $GITHUB_OUTPUT
  - id: bazel_5
- run: echo "bazelversion=5.3.2" >> $GITHUB_OUTPUT
+ run: echo "bazelversion=5.4.0" >> $GITHUB_OUTPUT
  outputs:
  # Will look like ["<version from .bazelversion>", "5.3.2"]
  bazelversions: ${{ toJSON(steps.*.outputs.bazelversion) }}
@@ -75,18 +93,7 @@ jobs:
  bazelversion: ${{ fromJSON(needs.matrix-prep-bazelversion.outputs.bazelversions) }}
  folder: ${{ fromJSON(inputs.folders) }}
  bzlmodEnabled: [true, false]
- exclude:
- # Don't test bzlmod with Bazel 5 (not supported)
- - bazelversion: 5.3.2
- bzlmodEnabled: true
- # Don't test macos with Bazel 5 to minimize macOS minutes (billed at 10X)
- # https://docs.github.com/en/billing/managing-billing-for-github-actions/about-billing-for-github-actions#included-storage-and-minutes
- - os: macos-latest
- bazelversion: 5.3.2
- # Don't test Windows with Bazel 5 to minimize Windows minutes (billed at 2X)
- # https://docs.github.com/en/billing/managing-billing-for-github-actions/about-billing-for-github-actions#included-storage-and-minutes
- - os: windows-latest
- bazelversion: 5.3.2
+ exclude: ${{ fromJSON(inputs.exclude) }}
 
  # Steps represent a sequence of tasks that will be executed as part of the job
  steps: