Add GitHub Actions workflow for building and pushing Docker image

.forgejo/workflows/push.yaml

@@ -0,0 +1,17 @@
+on: [push]
+jobs:
+  build:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: code.edgarpierre.fr/edpibu/botbotbot:${{ github.ref_name}}
+          secrets: |
+            DOCKER_USERNAME=${{ secrets.DOCKER_USERNAME }}
+            DOCKER_PASSWORD=${{ secrets.DOCKER_PASSWORD }}