refactor: Use pre-built GHCR image by default in compose.yml

- Changed compose.yml to use ghcr.io/netresearch/moodle-docker/moodle:latest
- Commented out build directive (can be uncommented for local builds)
- Updated README quick start to reflect image pull workflow
- Added local build instructions for customization
- Updated CI workflow to switch to local build for testing

Benefits:
- Faster deployment (no build time required)
- Consistent images across deployments
- Still supports local builds when needed

Author: CybotTM

.github/workflows/docker-build.yml

@@ -174,6 +174,14 @@ jobs:
           sed -i 's/CHANGE_ME_SECURE_ROOT_PASSWORD_HERE/test_root_456/g' .env
           sed -i 's/CHANGE_ME_SECURE_VALKEY_PASSWORD_HERE/test_valkey_789/g' .env
 
+      - name: Configure for local build
+        run: |
+          # Use local build instead of pulling from GHCR for testing
+          sed -i 's|image: ghcr.io/netresearch/moodle-docker/moodle:latest|# image: ghcr.io/netresearch/moodle-docker/moodle:latest|' compose.yml
+          sed -i 's|# build:|build:|' compose.yml
+          sed -i 's|#   context: ./docker/moodle|  context: ./docker/moodle|' compose.yml
+          sed -i 's|#   dockerfile: Dockerfile|  dockerfile: Dockerfile|' compose.yml
+
       - name: Build and start services
         run: |
           docker compose build --no-cache

README.md

@@ -56,6 +56,23 @@ Available tags:
 - `main` - Latest build from main branch
 - `main-<sha>` - Specific commit from main branch
 
+### Building Locally
+
+To build the Moodle image locally (for customization or offline use):
+
+```bash
+# Edit compose.yml and uncomment the build section:
+services:
+  moodle:
+    # image: ghcr.io/netresearch/moodle-docker/moodle:latest
+    build:
+      context: ./docker/moodle
+      dockerfile: Dockerfile
+
+# Then build
+docker compose build
+```
+
 ## Prerequisites
 
 - Docker Engine 20.10.15+
@@ -100,13 +117,10 @@ nano .env
 - `VALKEY_PASSWORD`: Set secure password
 - `MOODLE_SITE_URL`: Update for production (e.g., `https://moodle.example.com`)
 
-### 3. Build and Start Services
+### 3. Start Services
 
 ```bash
-# Build Moodle image
-docker compose build
-
-# Start all services
+# Pull pre-built image and start all services
 docker compose up -d
 
 # Check status

compose.yml

@@ -6,9 +6,11 @@ version: '3.8'
 services:
   # Moodle Application (PHP 8.3 + Apache)
   moodle:
-    build:
-      context: ./docker/moodle
-      dockerfile: Dockerfile
+    image: ghcr.io/netresearch/moodle-docker/moodle:latest
+    # Uncomment to build locally instead of using pre-built image:
+    # build:
+    #   context: ./docker/moodle
+    #   dockerfile: Dockerfile
     container_name: ${COMPOSE_PROJECT_NAME:-moodle45}_moodle
     restart: unless-stopped
     networks: