Refactor Dockerfile and update coding standards

- Refactor Dockerfile to improve build efficiency and clarity.
- Enhance coding standards in coderule.mdc for better maintainability.
- Add new rules to python.mdc to improve code quality.

.woodpecker.yml

@@ -0,0 +1,15 @@
+when:
+  branch: [stage, main]
+  event: push
+
+steps:
+  - name: build-and-push
+    image: plugins/docker
+    settings:
+      dockerfile: Dockerfile
+      context: .
+      repo: registry:5000/flights
+      tags:
+        - "${CI_COMMIT_BRANCH}"
+        - "${CI_COMMIT_SHA:0:8}"
+      insecure: true