migrated to workflows

.forgejo/workflows/docker.yml

@@ -0,0 +1,32 @@
+name: Build and Push Docker image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  docker:
+    name: Build and Push Docker image
+    runs-on: docker
+    container:
+      image: ghcr.io/catthehacker/ubuntu:act-latest
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Login to cr.sp-codes.de
+        uses: docker/login-action@v2
+        with:
+          registry: cr.sp-codes.de
+          username: ${{ secrets.CR_USERNAME }}
+          password: ${{ secrets.CR_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          push: true
+          tags: |
+            samuelph/connectivity-check:latest
+            cr.sp-codes.de/samuel-p/connectivity-check:latest