added workflow for building on push to dev branch

.github/workflows/dev-docker-image.yml

@@ -0,0 +1,15 @@
+name: Development Docker Image CI for GHCR
+
+on:
+ push:
+ branches: [ "dev" ]
+jobs:
+ build_and_publish:
+ runs-on: ubuntu-latest
+ steps:
+ - uses: actions/checkout@main
+ - name: Build and publish the development Docker image to GHCR
+ run: |
+ docker login --username raycadle --password ${{ secrets.GH_PAT }} ghcr.io
+ docker build --build-arg BUILD_DATE="$(date +%d/%m/%y)" --build-arg VERSION="$(date +%R:%S)" --tag ghcr.io/raycadle/ntfy-dev:latest .
+ docker push ghcr.io/raycadle/ntfy-dev:latest