fix(martin): bake config into image via Dockerfile (Portainer volume mount fix)

Portainer CE deploys only docker-compose.yml — ./martin.yaml not present on host,
so Docker creates an empty directory instead of mounting the file. Solution: COPY
martin.yaml into the image at build time, eliminating the volume dependency.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -102,7 +102,9 @@ services:
       start_period: 10s
 
   martin:
-    image: ghcr.io/maplibre/martin:1.4.0
+    build:
+      context: .
+      dockerfile: martin.Dockerfile
     container_name: martin
     restart: unless-stopped
     ports:
@@ -110,5 +112,3 @@ services:
     command: ["--config", "/config/martin.yaml"]
     environment:
       - DATABASE_URL=postgresql://architools_user:stictMyFon34!_gonY@10.10.10.166:5432/architools_db
-    volumes:
-      - ./martin.yaml:/config/martin.yaml:ro