Merge pull request #41 from Digital-Defiance/40-setup-devcontainer-pr…

…e-builds

feat: setup pre-build workflow

.github/workflows/pre-build-dev-container.yml

@@ -0,0 +1,41 @@
+name: Dev Container Build and Push Image
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - '.github/.devcontainer/**'
+    branches:
+      - "main"
+    tags:
+      - "v*.*.*"
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+    - 
+      name: Checkout
+      id: checkout
+      uses: actions/checkout@v1
+    -
+        name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+    - id: lower-repo
+      run: |
+        echo "GITHUB_REPOSITORY_LOWER=${GITHUB_REPOSITORY@L}" >> $GITHUB_ENV
+
+    - 
+        name: Pre-build dev container image
+        uses: devcontainers/[email protected]
+        with:
+          subFolder: .github
+          imageName: ghcr.io/${{ env.GITHUB_REPOSITORY_LOWER }}
+          cacheFrom: ghcr.io/${{ env.GITHUB_REPOSITORY_LOWER }}
+          push: always
+