fix(cd): ensure lowercase image name for GHCR compatibility

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nanotaboada

.github/workflows/maven-cd.yml

@@ -79,6 +79,10 @@ jobs:
             - name: Set up Docker Buildx
               uses: docker/setup-buildx-action@v4.0.0
 
+            - name: Set image name
+              id: image
+              run: echo "name=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> "$GITHUB_OUTPUT"
+
             - name: Build and push Docker image to GitHub Container Registry
               uses: docker/build-push-action@v7.0.0
               with:
@@ -89,9 +93,9 @@ jobs:
                   cache-from: type=gha
                   cache-to: type=gha,mode=max
                   tags: |
-                      ghcr.io/${{ github.repository }}:latest
-                      ghcr.io/${{ github.repository }}:${{ steps.tag.outputs.semver }}
-                      ghcr.io/${{ github.repository }}:${{ steps.tag.outputs.club }}
+                      ghcr.io/${{ steps.image.outputs.name }}:latest
+                      ghcr.io/${{ steps.image.outputs.name }}:${{ steps.tag.outputs.semver }}
+                      ghcr.io/${{ steps.image.outputs.name }}:${{ steps.tag.outputs.club }}
 
             - name: Generate changelog
               id: changelog
@@ -121,19 +125,19 @@ jobs:
 
                       ```bash
                       # By semantic version (recommended)
-                      docker pull ghcr.io/${{ github.repository }}:${{ steps.tag.outputs.semver }}
+                      docker pull ghcr.io/${{ steps.image.outputs.name }}:${{ steps.tag.outputs.semver }}
 
                       # By club name
-                      docker pull ghcr.io/${{ github.repository }}:${{ steps.tag.outputs.club }}
+                      docker pull ghcr.io/${{ steps.image.outputs.name }}:${{ steps.tag.outputs.club }}
 
                       # Latest
-                      docker pull ghcr.io/${{ github.repository }}:latest
+                      docker pull ghcr.io/${{ steps.image.outputs.name }}:latest
                       ```
 
                       ## Quick Start
 
                       ```bash
-                      docker run -p 9000:9000 ghcr.io/${{ github.repository }}:${{ steps.tag.outputs.semver }}
+                      docker run -p 9000:9000 ghcr.io/${{ steps.image.outputs.name }}:${{ steps.tag.outputs.semver }}
                       ```
 
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