chore: migrate repo to coreci owner

---ci---
project: atelier
phase: 0
milestone: v0.1
status: complete
phase_role: final
type: migration
---/ci---

Repo transferred on Gitea: cloudinit-bot/atelier -> coreci/atelier.
Local remote URL updated. config.json release.owner and gitea.owner updated: cloudinit-bot -> coreci.
All 8 tags and 8 releases preserved through the transfer.

.ciagent/config.json

@@ -53,13 +53,13 @@
   "release": {
     "forge": "gitea",
     "base_url": "https://git.cloudinit.dev",
-    "owner": "cloudinit-bot",
+    "owner": "coreci",
     "repo": "atelier"
   },
   "gitea": {
     "base_url": "https://git.cloudinit.dev",
     "api_token_env": "GITEA_API_TOKEN",
-    "owner": "cloudinit-bot",
+    "owner": "coreci",
     "repo": "atelier"
   },
   "ship": {