Regenerate the cache completely, once a day (#253)

.github/workflows/regenerate-cache.yml

@@ -0,0 +1,36 @@
+name: Regenerate cache
+
+on:
+  schedule:
+    # Daily
+    - cron: '23 1 * * *'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      # Caches and restores the bazelisk download directory, the bazel build directory.
+      - name: Cache bazel
+        uses: actions/cache@v4
+        env:
+          cache-name: bazel-cache
+        with:
+          path: |
+            ~/.cache/bazelisk
+            ~/.cache/bazel
+            ~/.cache/bazel-repo
+          key: ${{ runner.os }}-${{ env.cache-name }}-${{ github.ref }}-${{ github.sha }}
+          # Pull caches from:
+          # - The current sha,
+          # - The current branch,
+          # - base branch
+          restore-keys: |
+            ${{ runner.os }}-${{ env.cache-name }}-${{ github.ref }}-${{ github.sha }}
+            ${{ runner.os }}-${{ env.cache-name }}-${{ github.ref }}-
+            ${{ runner.os }}-${{ env.cache-name }}-refs/heads/${{ github.base_ref }}-
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Bazel clean
+        run: bazel --bazelrc=.github/workflows/ci.bazelrc --bazelrc=.bazelrc clean --expunge
+      - name: bazel test //...
+        run: bazel --bazelrc=.github/workflows/ci.bazelrc --bazelrc=.bazelrc test //...