add k8s deployment, improved Dockerfiles and docker-compose.yaml files

docker-compose.yml

@@ -19,8 +19,7 @@ services:
     build:
       dockerfile: ./data-manager/Dockerfile
       context: ./services
-      target: dev  # prod
-    command: "--http=0.0.0.0:8090 --dir=/htwkalender-data-manager/data/pb_data"
+      target: prod
     ports:
       - "8090:8090"
       - "50051:50051"
@@ -33,7 +32,7 @@ services:
     build:
       dockerfile: ./ical/Dockerfile
       context: ./services
-      target: dev  # prod
+      target: prod
     environment:
       - DATA_MANAGER_URL=htwkalender-data-manager
     depends_on:
@@ -43,7 +42,7 @@ services:
     build:
       dockerfile: Dockerfile
       context: ./frontend
-      target: dev
+      target: prod
     command: "npm run dev"
     # open port 8000
     ports: