fix docker image casing error

.gitea/workflows/deploy.yml

@@ -5,7 +5,7 @@ on:
 
 env:
   REGISTRY: git.aggtaa.com
-  IMAGE_PREFIX: ${{ gitea.repository }}
+#  IMAGE_PREFIX: ${{ gitea.repository }} # set by a step
 
 jobs:
   # ── BUILD SERVER ──────────────────────────────────────────────────────────────
@@ -26,6 +26,9 @@ jobs:
             git clone ${{ gitea.server_url }}/${{ gitea.repository }}.git /workspace
           fi
 
+      - name: Set lowercase image prefix
+        run: echo "IMAGE_PREFIX=$(echo '${{ gitea.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
       - name: Build & push app
         run: |
           echo "${{ secrets.REGISTRY_PASSWORD }}" | \