ci: make deploy.json update non-fatal

The step uses `docker exec xetup-web`, which needs the docker socket in the
job container (runner container.docker_host is "-", so it is absent). It runs
after the signed release is published and only refreshes a cosmetic "last
build" indicator, so its failure must not fail the build.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.forgejo/workflows/release.yml

@@ -133,6 +133,11 @@ jobs:
           echo "Released xetup.exe (commit ${SHORT})"
 
       - name: Update deploy.json
+        # Cosmetic "last build" indicator. Requires docker.sock in the job
+        # container (runner container.docker_host). Non-fatal: the signed
+        # release is already published by this point, so a failure here must
+        # not fail the build.
+        continue-on-error: true
         run: |
           SHORT=$(echo "${{ github.sha }}" | cut -c1-7)
           TS=$(date -u +%Y-%m-%dT%H:%M:%SZ)