fix(ci): raise max-parallel to 9, make gitops push failures actually fail the job

Bumped runner.capacity from 1 to 3 on all 3 runner pods (9 total
concurrent slots - nodes were sitting at 7-11% CPU during builds, so
plenty of headroom), matched here with max-parallel: 9.

Also fixed a real bug: the gitops-push retry loop had no check after
exhausting all attempts, so a job whose every push attempt failed
would still exit 0 and report "success" - which is exactly what
happened on the previous run (verified: all 20 services built and
pushed their images correctly, but the actual GITOPS_PAT secret was
invalid/expired, and the retry loop silently swallowed the resulting
failure across all 20 jobs). Fixed the secret itself (confirmed the
existing admin-scoped Forgejo token has valid push access to
ashwin/nxtgauge-gitops and rotated GITOPS_PAT to it), and added an
explicit exit 1 if the retry loop exhausts without a successful push.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.forgejo/workflows/build.yaml

@@ -15,7 +15,7 @@ jobs:
     runs-on: docker-ready
     strategy:
       fail-fast: false
-      max-parallel: 3
+      max-parallel: 9
       matrix:
         service:
           - gateway
@@ -171,15 +171,17 @@ jobs:
           git clone "https://forgejo-actions:${GITOPS_PAT}@${GITOPS_SERVER}/${GITOPS_OWNER}/${GITOPS_REPO}.git" /tmp/nxtgauge-gitops
           cd /tmp/nxtgauge-gitops
 
-          # Up to 3 of these jobs can be pushing to the same gitops branch at
+          # Up to 9 of these jobs can be pushing to the same gitops branch at
           # once now - retry with a fresh pull+rebase on a non-fast-forward
           # rejection instead of assuming we're the only writer.
-          for attempt in 1 2 3 4 5; do
+          pushed=false
+          for attempt in 1 2 3 4 5 6 7 8; do
             git checkout "$GITOPS_BRANCH"
             ./scripts/set-backend-rust-release.sh "$service" "$DIGEST"
 
             if git diff --quiet; then
               echo "GitOps repo already up to date for $service."
+              pushed=true
               break
             fi
 
@@ -192,11 +194,17 @@ jobs:
             git commit -m "chore(gitops): update ${service} image for ${SHA}"
 
             if git push origin "HEAD:${GITOPS_BRANCH}"; then
+              pushed=true
               break
             fi
 
-            echo "Push rejected (attempt $attempt/5), pulling latest and retrying..."
+            echo "Push rejected (attempt $attempt/8), pulling latest and retrying..."
             git fetch origin "$GITOPS_BRANCH"
             git reset --hard "origin/${GITOPS_BRANCH}"
             sleep $((attempt * 2))
           done
+
+          if [ "$pushed" != true ]; then
+            echo "Failed to push gitops update for $service after all retries" >&2
+            exit 1
+          fi