feat: add devcontainer container on ghcr (#1240)

Signed-off-by: Devin Buhl <devin@buhl.casa>

.github/workflows/publish-devcontainer.yaml

@@ -0,0 +1,42 @@
+---
+name: "Publish devcontainer"
+
+on:
+  workflow_dispatch:
+  push:
+    branches: ["main"]
+    paths: [".devcontainer/devcontainer.build.json"]
+  pull_request:
+    branches: ["main"]
+    paths: [".devcontainer/devcontainer.build.json"]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  publish-devcontainer:
+    name: Publish devcontainer
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - if: ${{ github.event_name != 'pull_request' }}
+        name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: devcontainers/ci@v0.3
+        with:
+          imageName: ghcr.io/${{ github.repository }}/devcontainer
+          imageTag: base,latest
+          configFile: .devcontainer/devcontainer.build.json
+          push: ${{ github.event_name == 'pull_request' && 'never' || 'always' }}