feat: Add a new step to the deploy pipeline to update Kubernetes manifests with the latest image tag.

Reviewed-on: #2

.drone.yml

@@ -1,6 +1,7 @@
 kind: pipeline
 type: kubernetes
 name: pr-check
+
 trigger:
   event:
     - pull_request
@@ -16,6 +17,7 @@ steps:
 kind: pipeline
 type: kubernetes
 name: deploy
+
 trigger:
   branch:
     - main
@@ -40,3 +42,21 @@ steps:
         from_secret: gitea_username
       password:
         from_secret: gitea_password
+
+  - name: update-manifests
+    image: alpine:3.20
+    environment:
+      GITEA_USERNAME:
+        from_secret: gitea_username
+      GITEA_PASSWORD:
+        from_secret: gitea_password
+    commands:
+      - apk add --no-cache git sed
+      - git clone https://gitea.mnky-code.de/mnky/k8s-manifests.git
+      - cd k8s-manifests
+      - 'sed -i "s|image: gitea.mnky-code.de/mnky/ngrx-playground:.*|image: gitea.mnky-code.de/mnky/ngrx-playground:${DRONE_COMMIT_SHA}|" ngrx-playground/deployment.yaml'
+      - git config user.name "drone"
+      - git config user.email "drone@mnky-code.de"
+      - git add ngrx-playground/deployment.yaml
+      - 'git commit -m "Deploy ngrx-playground ${DRONE_COMMIT_SHA}" || exit 0'
+      - 'git push https://${GITEA_USERNAME}:${GITEA_PASSWORD}@gitea.mnky-code.de/mnky/k8s-manifests.git HEAD:main'