Caching of the Docker image from the devcontainer

.github/workflows/devcontainer.yml

@@ -14,8 +14,17 @@ jobs:
       - name: Checkout (GitHub)
         uses: actions/checkout@v3
 
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2 
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # See https://github.com/devcontainers/ci/blob/main/docs/github-action.md
       - name: Build and run dev container task
         uses: devcontainers/[email protected]
         with:
+          imageName: ghcr.io/PRL-PRG/r-compile-server
           # Change this to be your CI task/script
           runCmd: mvn --batch-mode --update-snapshots test