build: fix ci build caching (#25)

.github/workflows/ci.bazelrc

@@ -2,6 +2,6 @@
 # Included with a --bazelrc option in the call to bazel
 build --announce_rc
 test --test_output=errors
-build --disk_cache=$HOME/.cache/bazel
-build --repository_cache=$HOME/.cache/bazel-repo
+build --disk_cache=~/.cache/bazel
+build --repository_cache=~/.cache/bazel-repo
 test --test_env=XDG_CACHE_HOME

.github/workflows/ci.yaml

@@ -21,16 +21,14 @@ jobs:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
       - uses: bazelbuild/setup-bazelisk@v1
-      - name: Mount bazel action cache
+      - name: Mount bazel caches
         uses: actions/cache@v2
         with:
-          path: "~/.cache/bazel"
-          key: bazel
-      - name: Mount bazel repo cache
-        uses: actions/cache@v2
-        with:
-          path: "~/.cache/bazel-repo"
-          key: bazel-repo
+          path: |
+            "~/.cache/bazel"
+            "~/.cache/bazel-repo"
+          key: bazel-cache-${{ hashFiles('**/BUILD.bazel', '**/*.bzl', 'WORKSPACE') }}
+          restore-keys: bazel-cache-
       - name: bazel test //...
         env:
           # Bazelisk will download bazel to here

.github/workflows/release.yml

@@ -14,6 +14,14 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+      - name: Mount bazel caches
+        uses: actions/cache@v2
+        with:
+          path: |
+            "~/.cache/bazel"
+            "~/.cache/bazel-repo"
+          key: bazel-cache-${{ hashFiles('**/BUILD.bazel', '**/*.bzl', 'WORKSPACE') }}
+          restore-keys: bazel-cache-
       - name: bazel test //...
         env:
           # Bazelisk will download bazel to here