Refactor sanitizer CI (#344)

Remove Ubuntu 20.04 fromm the Asan workflow and introduce caching.
Sanitized builds require a large cache, making multi-os checks
infeasible at the moment.

.github/workflows/main.yml

@@ -142,38 +142,3 @@ jobs:
 
     - name: Run tests
       run: ./run_integration_tests.sh
-
-  asan-tests:
-    # The type of runner that the job will run on.
-    runs-on: ubuntu-22.04
-    strategy:
-      matrix:
-        # Which OS versions we will test on.
-        os_version: [ 20.04, 22.04 ]
-    steps:
-    - uses: actions/checkout@v3.5.3
-      with:
-        fetch-depth: 0
-
-    - uses: docker/setup-buildx-action@v2
-    - uses: docker/build-push-action@v4
-      with:
-        context: .
-        file: ./deployment-examples/docker-compose/Dockerfile
-        build-args: |
-          OS_VERSION=${{ matrix.os_version }}
-        load: true # This brings the build into `docker images` from buildx.
-        tags: allada/turbo-cache:asan-test
-        target: dependencies
-
-    - name: Bazel test
-      run: |
-        docker run \
-          -e TURBO_CACHE_DIR=/tmp/turbo-cache \
-          --rm \
-          -w /root/turbo-cache \
-          -v $PWD:/root/turbo-cache \
-          allada/turbo-cache:asan-test \
-          bazel test \
-            --config=asan \
-            //...

.github/workflows/sanitizers.yaml

@@ -0,0 +1,37 @@
+---
+name: Sanitizers
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions: read-all
+
+jobs:
+  sanitized-tests:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-22.04]
+        sanitizer: [asan]
+    name: ${{ matrix.sanitizer }} / ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: >- # v4.1.1
+          actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
+
+      - uses: >- # Custom commit at 2023-10-23
+          bazelbuild/setup-bazelisk@5bc144ec07bd24eaa9b5c3e8c9af4006b033b629
+
+      - name: Mount bazel cache
+        uses: >- # v3.3.2
+          actions/cache@704facf57e6136b1bc63b828d79edcd491f0ee84
+        with:
+          path: ~/.cache/bazel
+          key: ${{ matrix.os }}-bazel-${{ matrix.sanitizer }}
+
+      - name: Run Bazel tests
+        run: bazel test --config=${{ matrix.sanitizer }} //...
+        shell: bash