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Fix cache bug with Bazel builds in CI (#1593) 

Some time ago, bazel builds in CI were being sped up fine with caching. However, over time the cache got stale because `actions/cache@v3` apparently doesn't update caches when it "hits" unless it is configured to do so specifically. This requires using a uniqued per-commit `key` (to force it to update cache after each successful run) and a relaxed `restore-keys` which is not unique per-commit so newer commits can restore from the nearest hit.

Test GHA run 1 (no cache hit): [1h 1m 52s](https://github.com/sjain-stanford/torch-mlir/actions/runs/3474770334/usage)
Test GHA run 2 (cache hit, same commit): [5m 14s](https://github.com/sjain-stanford/torch-mlir/actions/runs/3475132135/usage)
Test GHA run 3 (cache hit, different commit): [6m 6s](https://github.com/sjain-stanford/torch-mlir/actions/runs/3475161009/usage)
pull/1596/head
Sambhav Jain 2022-11-15 18:48:31 -08:00 committed by GitHub
parent fc4c8d4ed9
commit 4aa1e90b34
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7
.github/workflows/bazelBuildAndTest.yml vendored
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@ -29,7 +29,12 @@ jobs:
uses: actions/cache@v3
with:
path: ~/.cache/bazel
key: ubuntu_x86_64_torch_mlir_bazel_build_cache
# Continually update cache even if there's a "hit" during
# restore to avoid the cache going stale over time
# https://github.com/actions/cache/blob/main/workarounds.md#update-a-cache
key: torch_mlir-bazel-build-cache-${{ runner.os }}-${{ github.sha }}
restore-keys: |
torch_mlir-bazel-build-cache-${{ runner.os }}
# Change bazel cache directory to root ownership
# to allow writing to it from within the docker container.