update signing properties + gitlab ci

backend/Dockerfile

@@ -34,7 +34,7 @@ LABEL org.opencontainers.image.title="kazier-server" \
       org.opencontainers.image.description="Kazier backend API (Go/Gin + PostgreSQL) — local-first document vault" \
       org.opencontainers.image.version="${VERSION}" \
       org.opencontainers.image.licenses="AGPL-3.0-only" \
-      org.opencontainers.image.source="https://gitlab.com/thirdshop-org/dot" \
+      org.opencontainers.image.source="https://gitlab.thirdshop.fr/thirdshop/kasier" \
       org.opencontainers.image.url="https://thirdshop.fr/en/applications/kazier/" \
       org.opencontainers.image.created="${BUILD_DATE}" \
       org.opencontainers.image.revision=""