ci: adds build and push for forgejo container registry

.forgejo/workflows/build-and-publish.yaml

@@ -0,0 +1,44 @@
+name: Build and publish
+
+on:
+  push:
+    branches:
+      - main
+      - dev
+
+jobs:
+  build-and-push-arch:
+    runs-on: docker
+    container:
+      image: ghcr.io/catthehacker/ubuntu:act-latest
+      options: -v /dind/docker.sock:/var/run/docker.sock
+    steps:
+      - name: Set TAG variable
+        id: set_tag
+        run: |
+          if [ "${{ github.ref }}" = "refs/heads/main" ]; then
+            echo "TAG=latest" >> $GITHUB_ENV
+          else
+            echo "TAG=${{ github.ref_name }}" >> $GITHUB_ENV
+          fi
+
+      - name: Checkout the repo
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to the registry
+        uses: docker/login-action@v3
+        with:
+          registry: guardianproject.dev
+          username: irl
+          password: ${{ secrets.PACKAGE_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: src/
+          file: src/Dockerfile
+          push: true
+          tags: guardianproject.dev/${{ github.repository }}:${{ env.TAG }}