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Jacob Pratt
f1051ed6f1
Add post-merge analysis CI workflow This PR adds a post-merge analysis workflow, which was discussed [here](https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/Reporting.20test.20suite.20statistics.20after.20merge). The workflow currently analyzes test suite results from bootstrap metrics. It downloads metrics for all known jobs in the parent and current (HEAD) commit, compares them and prints a truncated diff. It then posts this diff to the merged PR as a comment. Later I also want to add other statistics to the analysis, e.g. changes in CI/bootstrap step durations. It can be tested locally e.g. using this: ``` cargo run --release --manifest-path src/ci/citool/Cargo.toml post-merge-report3cb02729abfd17deacce``` This uses a slightly older commit as a parent, to have more results in the diff (normally the diff won't be so large). CC `@jieyouxu` r? `@marcoieni`