Add Docker support and GitHub Container Registry CI workflow (#3)

* Add comprehensive Docker support with multi-stage builds
* Set up GitHub Container Registry integration
* Enhance CI/CD workflows with Docker build and push capabilities
* Add --help and --version flags to main application
* Update documentation with Docker usage examples
* Implement security best practices for container deployment

.github/dependabot.yml

@@ -16,6 +16,52 @@ updates:
       prefix: 'ci'
       include: 'scope'
 
+  # Check for updates to Docker
+  - package-ecosystem: 'docker'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+      day: 'monday'
+      time: '07:00'
+      timezone: 'Europe/Amsterdam'
+    open-pull-requests-limit: 10
+    labels:
+      - 'dependencies'
+      - 'docker'
+    commit-message:
+      prefix: 'docker'
+      include: 'scope'
+    groups:
+      docker-images:
+        patterns:
+          - '*'
+        update-types:
+          - 'minor'
+          - 'patch'
+
+  # Check for updates to Docker Compose
+  - package-ecosystem: 'docker-compose'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+      day: 'monday'
+      time: '07:00'
+      timezone: 'Europe/Amsterdam'
+    open-pull-requests-limit: 10
+    labels:
+      - 'dependencies'
+      - 'docker-compose'
+    commit-message:
+      prefix: 'docker'
+      include: 'scope'
+    groups:
+      docker-compose:
+        patterns:
+          - '*'
+        update-types:
+          - 'minor'
+          - 'patch'
+
   # Check for updates to Go modules
   - package-ecosystem: 'gomod'
     directory: '/'