chore: add.nvmrc & cache Docker build(s) 📦 (#707)

* feat: add supoort for `.nvmrc`

Signed-off-by: Vinayak Kulkarni <19776877+vinayakkulkarni@users.noreply.github.com>

* perf: enable caching of docker builds

Signed-off-by: Vinayak Kulkarni <19776877+vinayakkulkarni@users.noreply.github.com>

Signed-off-by: Vinayak Kulkarni <19776877+vinayakkulkarni@users.noreply.github.com>

.github/workflows/ct.yml

@@ -50,7 +50,7 @@ jobs:
 
       - name: Run tests 🧪
         run: xvfb-run --server-args="-screen 0 1024x768x24" npm test
-        
+
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
         with:
@@ -58,10 +58,13 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
-        
+
       - name: Test Docker Build
         uses: docker/build-push-action@v3
         with:
           context: .
           push: false
           platforms: linux/arm64,linux/amd64
+          # experimental: https://github.com/docker/build-push-action/blob/master/docs/advanced/cache.md#cache-backend-api
+          cache-from: type=gha
+          cache-to: type=gha,mode=max