fix(deploy): lowercase GHCR image tags via metadata-action

Docker requires lowercase repository names. github.repository returns
RECTOR-LABS/core (uppercase org). Use docker/metadata-action to
auto-lowercase tags.

Author: rz1989s

.github/workflows/deploy.yml

@@ -8,7 +8,6 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
 
 jobs:
   deploy:
@@ -32,14 +31,21 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository }}
+          tags: |
+            type=raw,value=latest
+            type=sha
+
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with:
           context: .
           push: true
-          tags: |
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
+          tags: ${{ steps.meta.outputs.tags }}
           cache-from: type=gha
           cache-to: type=gha,mode=max