Add CI configuration for automated image deployment

.woodpecker/ci.yaml

@@ -0,0 +1,20 @@
+when:
+  - event: push
+    branch: main
+  - event: cron
+    cron: "upgrade base image"
+
+steps:
+  - name: deploy
+    image: debian:trixie
+    commands:
+      - apt update
+      - apt install -y buildah podman
+      - sudo podman login -d docker.io -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
+      - chmod +x ./push-image.sh
+      - ./push-image.sh
+    environment:
+      DOCKER_USERNAME:
+        from_secret: docker_username
+      DOCKER_PASSWORD:
+        from_secret: docker_password