Use a disk cache on windows

Building on windows currently takes a long time (> 2h) and fails eventually when the connection to
the build event upload service is closed.

Using a disk_cache which is stored in Github's action cache hopefully avoids
building stackage libraries every time.

Currently the cache key depends on the hash of the `stackage_snapshot.yaml` file, so it is
evicted whenever that file changes. There is no cache cleanup done currently.

.bazelrc.common

@@ -64,6 +64,7 @@ build:ci-common --experimental_repository_cache_hardlinks
 
 # Use a remote cache during CI
 build:ci-windows-bindist --bes_upload_mode=wait_for_upload_complete --bes_timeout=60s
+build:ci-windows-bindist --disk_cache=.bazel-cache/disk
 build:remote-cache --remote_cache=grpcs://remote.buildbuddy.io
 build:ci-common --remote_timeout=3600
 # Avoid failures of the form `deadline exceeded after 14999958197ns DEADLINE_EXCEEDED`.

.github/workflows/workflow.yaml

@@ -112,6 +112,11 @@ jobs:
           sudo apt clean
           docker rmi $(docker images -q) -f
       - uses: actions/checkout@v3
+      - name: Add disk cache
+        uses: actions/cache@v3
+        with:
+          path: .bazel-cache/disk
+          key: disk-cache-${{ runner.os }}-${{ hashFiles('stackage_snapshot.yaml') }}
       - name: Mount Bazel cache
         uses: actions/cache@v3
         with: