fix: rebuild without cache and simplify Dockerfile

- Force no-cache build in docker-compose
- Simplify Dockerfile to use Alpine package manager
- Clean up configuration

Dockerfile

@@ -1,4 +1,4 @@
 FROM registry:2
 
-# The registry:2 image is based on Alpine, so we use apk
+# Install apache2-utils using Alpine package manager
-RUN apk add --no-cache apache2-utils
+RUN apk --no-cache add apache2-utils

docker-compose.yml

@@ -2,7 +2,10 @@ version: '3.8'
 
 services:
   registry:
-    build: .
+    build:
+      context: .
+      dockerfile: Dockerfile
+      no-cache: true
     container_name: registry
     restart: unless-stopped
     expose: