fix(ci): stop the tag push from re-deploying, and make the infra bump idempotent

Two runs of the full build+deploy fired for every push, and the second died:

    nothing to commit, working tree clean
    ❌  Failure - Main Update infra repo

The deploy was fine both times — the second run had nothing left to do. The
cause is the pair of triggers meeting: ci.yml ran on `push` to main AND on a
`v*` tag, and cd.yml keys off "CI succeeded", so `git push origin main` followed
by `git push origin refs/tags/vX` produced two CI runs for one sha and two
deploys behind them. The tag run carries the same github.sha, so it rebuilt the
same image and then found the infra manifest already pointing at it.

Nothing consumed the tag-triggered run: there is no release workflow, and cd.yml
reads github.sha rather than the tag. Dropping `tags:` removes the duplicate
build outright.

The idempotency guard stays anyway, because a manual re-run has the same shape
and should not ring the CI-red alarm for work that is already done — infra#366
turns a red run into a tracked issue, so a false red costs a real triage.

Closes #118

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

.gitea/workflows/cd.yml

@@ -81,11 +81,19 @@ jobs:
           git config user.email "cd-bot@d-ma.be"
           git config user.name "CD Bot"
           git add "k3s/apps/supervisor/ingestion-deployment.yaml"
+          # Idempotent: `git commit` exits 1 on an empty index, so a run that
+          # finds the bump already applied failed the whole job and rang the
+          # CI-red alarm for a deploy that was fine (hyperguild#118). Two
+          # sources of a no-op run: a manual re-run, and the tag-push CI run
+          # that used to shadow the branch-push one for the same sha.
+          if git diff --cached --quiet; then
+            echo "Infra already at ${IMAGE_TAG} — nothing to commit"
+          else
             git commit -m "chore(deploy): ingestion → ${IMAGE_TAG}"
             GIT_SSH_COMMAND="ssh -i ~/.ssh/infra_deploy_key -o IdentitiesOnly=yes" \
               git push
-
             echo "Infra repo updated: ingestion → ${IMAGE_TAG}"
+          fi
 
       - name: Trigger Flux reconcile (immediate)
         run: |

.gitea/workflows/ci.yml

@@ -2,8 +2,13 @@ name: CI
 
 "on":
   push:
+    # Branch only. A `v*` tag here points at a commit main already tested, so
+    # the tag push re-ran the whole gate and — because cd.yml keys off "CI
+    # succeeded" — triggered a SECOND full image build and deploy for the same
+    # sha. That second deploy then died on "nothing to commit" (hyperguild#118).
+    # Nothing consumes a tag-triggered run: there is no release workflow, and
+    # cd.yml reads github.sha, not the tag.
     branches: [main]
-    tags: ["v*"]
   pull_request:
     branches: [main]