refactor: simplify registry to basic setup

- Reduce to only registry:2 image
- Remove unnecessary configuration files
- Add basic .gitignore and env.example
- Keep only essential docker-compose configuration

docker-compose.yml

@@ -2,38 +2,13 @@ version: '3.8'
 
 services:
   registry:
-    build: .
+    image: registry:2
     container_name: registry
     restart: unless-stopped
     expose:
       - "5000"
     volumes:
       - registry-data:/var/lib/registry
-      - registry-auth:/etc/docker/registry/auth
-      - ./config.yml:/etc/docker/registry/config.yml
-    networks:
-      - registry-network
-
-  registry-ui:
-    image: joxit/docker-registry-ui:latest
-    container_name: registry-ui
-    restart: unless-stopped
-    expose:
-      - "80"
-    environment:
-      - SINGLE_REGISTRY=${SINGLE_REGISTRY:-true}
-      - REGISTRY_TITLE=${REGISTRY_TITLE:-Docker Registry}
-      - DELETE_IMAGES=${DELETE_IMAGES:-true}
-      - SHOW_CONTENT_DIGEST=${SHOW_CONTENT_DIGEST:-true}
-      - NGINX_PROXY_PASS_URL=${REGISTRY_URL:-http://registry:5000}
-      - SHOW_CATALOG_NB_TAGS=${SHOW_CATALOG_NB_TAGS:-true}
-      - CATALOG_MIN_BRANCHES=${CATALOG_MIN_BRANCHES:-1}
-      - CATALOG_MAX_BRANCHES=${CATALOG_MAX_BRANCHES:-1}
-      - TAGLIST_PAGE_SIZE=${TAGLIST_PAGE_SIZE:-100}
-      - REGISTRY_SECURED=${REGISTRY_SECURED:-true}
-      - CATALOG_ELEMENTS_LIMIT=${CATALOG_ELEMENTS_LIMIT:-1000}
-    depends_on:
-      - registry
     networks:
       - registry-network
 
@@ -43,6 +18,4 @@ networks:
 
 volumes:
   registry-data:
-    driver: local
-  registry-auth:
     driver: local