feat: add CICD pipeline

.drone.yaml

@@ -0,0 +1,30 @@
+kind: pipeline
+type: docker
+
+name: build-and-push-container
+
+steps:
+  - name: build
+    image: docker:20
+    commands:
+      - docker build -t gitea.t000-n.de/t.behrendt/backupsidecar:latest .
+    when:
+      event:
+        - push
+      ref:
+        - refs/heads/main
+
+  - name: push
+    image: plugins/docker
+    settings:
+      username:
+        from_secret: REGISTRY_USERNAME
+      password:
+        from_secret: REGISTRY_PASSWORD
+      repo: gitea.t000-n.de/t.behrendt/backupsidecar
+      tags: latest
+    when:
+      event:
+        - push
+      ref:
+        - refs/heads/main