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ci: run Bazel Native nightly and on merge, not on every PR - #2880
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MarcusSorealheis merged 4 commits intoOct 20, 2026
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Combines TraceMachina#2877 + TraceMachina#2878 + TraceMachina#2880 on one branch so a single CI run shows the true end-state per-PR wall clock. Not for merge: the individual PRs are the review units; this exists to measure their net effect.
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Combines TraceMachina#2877 + TraceMachina#2878 + TraceMachina#2880 on one branch so a single CI run shows the true end-state per-PR wall clock. Not for merge: the individual PRs are the review units; this exists to measure their net effect.
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…achina#2880) on fork main Mirrors the intended upstream per-PR layout ahead of land: Bazel Native and Cargo Native (incl. Windows) move to nightly + merge-to-main; per-PR build/test signal is carried by the Nix Bazel Dev lane. Keeps the fork representative of where upstream CI is going, not where main happens to sit today. TraceMachina#2897 retry logic preserved in native-bazel.yaml.
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Completes the no-per-PR-OCI-builds intent: image-off-pr moved image.yaml off PRs and TraceMachina#2877 moved the nix integration job off PRs, but main.yaml's integration-tests (docker-compose image build + run_integration_tests.sh) fell between them and still ran on every PR. Defer to nightly + merge-to-main, matching TraceMachina#2880's pattern. Fork-local until folded into the upstream OCI/nightly set.
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…achina#2880) on fork main Mirrors the intended upstream per-PR layout ahead of land: Bazel Native and Cargo Native (incl. Windows) move to nightly + merge-to-main; per-PR build/test signal is carried by the Nix Bazel Dev lane. Keeps the fork representative of where upstream CI is going, not where main happens to sit today. TraceMachina#2897 retry logic preserved in native-bazel.yaml.
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Completes the no-per-PR-OCI-builds intent: image-off-pr moved image.yaml off PRs and TraceMachina#2877 moved the nix integration job off PRs, but main.yaml's integration-tests (docker-compose image build + run_integration_tests.sh) fell between them and still ran on every PR. Defer to nightly + merge-to-main, matching TraceMachina#2880's pattern. Fork-local until folded into the upstream OCI/nightly set.
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The non-Nix Bazel Native lane (Bazel 9.1.1 + 8.7.0) duplicates the per-PR build/test signal from the Nix Bazel Dev lane. Drop its pull_request trigger (keep push:main, add schedule + workflow_dispatch) to take ~12 min off every PR; non-Nix build breakage is caught nightly and on merge.
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What and why
Bazel Nativebuilds and tests with the non-Nix Bazel toolchain on every pull request: Bazel 9.1.1, plus an 8.7.0 leg that checks lockfile compatibility. Nix's Bazel Dev lane already runs the samebazel test //...on every PR. This moves Bazel Native to a nightly run plus every merge tomain, withworkflow_dispatchfor on-demand runs. Its runs onmaintoday took 7 to 11 minutes.How was this verified?
The workflow parses. The job matrix and every step are unchanged: the
pull_requesttrigger is removed,push: mainstays, andscheduleandworkflow_dispatchare added. It is not a required status check, so dropping the PR trigger doesn't block merges.Our fork's
mainhas run this schedule since 2026-10-14, and today's scheduled Bazel Native run there passed.Risk
This is the most debatable change in the CI-deferral set. A break in the non-Nix Bazel build, or in the 8.7.0 lockfile check, would be caught on merge or overnight instead of on the PR. People who build without Nix would see that breakage after merge.
Bazel Dev still builds and tests everything on each PR, and
push: mainkeeps a check at merge time. No source, config or wire-format changes. If you'd rather keep non-Nix Bazel on PRs, this is the one to drop.AI assistance
Claude drafted this change and description under my direction.