Add GitHub Actions workflow for dev image build

Author: fxai

.github/workflows/dev_build_push.yml

@@ -0,0 +1,33 @@
+name: Build dev image (manual)
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    # Only allow running on the dev branch
+    if: github.ref == 'refs/heads/dev'
+
+    steps:
+      - name: Checkout dev branch
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push :dev image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ghcr.io/${{ github.repository }}:dev
+          cache-from: type=gha
+          cache-to: type=gha,mode=max