fix(image-automation): unpin the gitea-mcp ImageRepository

Renovate #1439 pinned a digest into the ImageRepository's spec.image,
which image-reflector rejects ("should not include a tag"), so Flux
stopped tracking gitea-mcp-server. The image was missing from the
renovate.json list of images Flux image automation already bumps; add
it there so Renovate leaves it alone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kubernetes/infrastructure/image-automation/gitea-mcp.yaml

@@ -4,7 +4,7 @@ metadata:
   name: gitea-mcp
   namespace: flux-system
 spec:
-  image: docker.gitea.com/gitea-mcp-server@sha256:ccdb5660ecdf54c5e480f10cc8120ba2bf150b582cea8a1974de2e59883582d3
+  image: docker.gitea.com/gitea-mcp-server
   interval: 1h
 ---
 apiVersion: image.toolkit.fluxcd.io/v1

renovate.json

@@ -31,6 +31,7 @@
       "matchPackageNames": [
         "apache/tika",
         "deluan/navidrome",
+        "docker.gitea.com/gitea-mcp-server",
         "eclipse-mosquitto",
         "everythingsmarthome/everything-presence-mmwave-configurator",
         "ghcr.io/advplyr/audiobookshelf",