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ci: refactor self-hosted bazel setup into composite action #314

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ci: refactor self-hosted bazel setup into composite action #314

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17 changes: 17 additions & 0 deletions .github/actions/setup-bazel-self-hosted/action.yml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
# Licensed under the Apache-2.0 license

name: 'Setup Bazel (Self-Hosted)'
description: 'Configure Bazel for self-hosted runners with local persistent caching'
runs:
using: "composite"
steps:
- name: Setup Bazel
uses: bazel-contrib/setup-bazel@0.19.0
with:
bazelisk-cache: false
disk-cache: false
repository-cache: false
output-base: ${{ runner.workspace }}/.bazel
bazelrc: |
build --disk_cache=/home/github-runner/.cache/bazel-disk
common --repository_cache=/home/github-runner/.cache/bazel-repo
Comment on lines +15 to +17

@cfrantz cfrantz Jun 20, 2026

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If you can control which file this gets written to (e.g. self-hosted.bazelrc), we could use a try-import in the project's .bazelrc to import it if-and-only-if it exists.

In our .bazelrc, we'd add something like this:

# User bazelrc file
# =================
# See https://bazel.build/configure/best-practices#bazelrc-file
#
# Note: this should be at the bottom of the file, so that user-specified
# options override anything in this file
# (https://bazel.build/run/bazelrc#imports)
try-import %workspace%/self-hosted.bazelrc

18 changes: 3 additions & 15 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -20,11 +20,7 @@ jobs:
- uses: actions/checkout@v6

- name: Setup Bazel
uses: bazel-contrib/setup-bazel@0.19.0
with:
bazelisk-cache: false
disk-cache: false
repository-cache: false
uses: ./.github/actions/setup-bazel-self-hosted

- name: Presubmit Checks
# The presubmit workflow performs formatting checks, license checks
Expand All @@ -40,11 +36,7 @@ jobs:
- uses: actions/checkout@v6

- name: Setup Bazel
uses: bazel-contrib/setup-bazel@0.19.0
with:
bazelisk-cache: false
disk-cache: false
repository-cache: false
uses: ./.github/actions/setup-bazel-self-hosted

- name: Run tests
# See workflows.json for the `ci` definition.
Expand All @@ -59,11 +51,7 @@ jobs:
- uses: actions/checkout@v6

- name: Setup Bazel
uses: bazel-contrib/setup-bazel@0.19.0
with:
bazelisk-cache: false
disk-cache: false
repository-cache: false
uses: ./.github/actions/setup-bazel-self-hosted

- name: Build
# See workflows.json for the `default` definition.
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