feat: only load docker when needed

.github/actions/build-cache/action.yml

@@ -1,5 +1,10 @@
 name: Build Cache
 description: Cache builds
+inputs:
+  docker:
+    description: If the test should load docker images
+    required: false
+    default: false
 runs:
   using: "composite"
   # Make sure to keep these cache entries in sync with those in writecache.yml
@@ -22,6 +27,7 @@ runs:
           ${{ runner.os }}-hermit-cache-
     - name: Restore Docker Images
       uses: ScribeMD/[email protected]
+      if: inputs.docker == 'true'
       with:
         key: docker-${{ runner.os }}-${{ hashFiles('docker-compose.yml') }}
         read-only: true

.github/workflows/ci.yml

@@ -267,12 +267,26 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
+      - name: Check if Docker Required
+        id: check-docker
+        run: |
+          result="$(git grep -E '//ftl:subscribe|DefaultPostgresDatabaseConfig|DefaultMySQLDatabaseConfig' -- "$(git grep -l '^//go:build integration' | xargs grep -l '^func ${{ matrix.test }}' | xargs -I {} dirname ./{})/testdata" || true)"
+          if [ -z "$result" ]; then
+            echo "docker not required"
+            echo "docker_req=false" >> "$GITHUB_ENV"
+          else
+            echo "docker required"
+            echo "docker_req=true" >> "$GITHUB_ENV"
+          fi
       - name: Build Cache
         uses: ./.github/actions/build-cache
+        with:
+          docker: ${{ env.docker_req }}
       - name: Init Hermit
         uses: cashapp/[email protected]
       - name: Docker Compose
         run: just compose-up
+        if: env.docker_req == 'true'
       - name: Download Go Modules
         run: go mod download
       - name: Build Language Plugins