switch devcontainer build to use devcontainer/ci action

.devcontainer/devcontainer.json

@@ -1,10 +1,11 @@
 {
   // Uncomment this and comment "image" out for local devcontainer building.
-  // "build": {
-  //   "dockerfile": "Dockerfile",
-  //   "context": "../"
-  // },
-  "image": "ghcr.io/nrel/buildingmotif/devcontainer:ts-devcontainers",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": "../",
+    "cacheFrom": "ghcr.io/nrel/buildingmotif/devcontainer:ts-devcontainers"
+  },
+  // "image": "ghcr.io/nrel/buildingmotif/devcontainer:ts-devcontainers",
   "runArgs": ["--net=host"], // Use host network for webapp (which only listens for localhost by default)
   "features": {
     "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {},

.github/workflows/devcontainer.yml

@@ -42,15 +42,11 @@ jobs:
             type=sha
             type=edge
 
-      - name: Build and push
-        uses: docker/build-push-action@v6
+      - name: Pre-build dev container image
+        uses: devcontainers/[email protected]
         with:
-          context: .
-          file: .devcontainer/Dockerfile
-          push: true
-          target: devcontainer
-          platforms: linux/amd64,linux/arm64
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.output.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          imageName: ${{ env.REGISTRY }}/${{ github.repository }}/devcontainer:ts-devcontainers
+          imageTag: ${{ steps.meta.outputs.tags }}
+          cacheFrom: ${{ env.REGISTRY }}/${{ github.repository }}/devcontainer:ts-devcontainers
+          push: always
+          platform: linux/amd64,linux/arm64