fix: release to the Gitea API on its public URL (#997)

goreleaser's gitea_urls.api still pointed at the AWS in-cluster service (gitea-http.gitea.svc.cluster.local), which does not resolve from the Frostmoln runner. Use https://git.unbound.se/api/v1. Also drop RELEASE_TOKEN_FILE=/runner-secrets/release-token (the AWS runner mount); the Frostmoln runner exports RELEASE_TOKEN_FILE itself.

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https://claude.ai/code/session_01Ma8eHhW59hLAJuLzBnLvUu
Reviewed-on: #997

.goreleaser.yml

@@ -2,7 +2,7 @@ project_name: unbound-schemas
 version: 2
 
 gitea_urls:
-  api: http://gitea-http.gitea.svc.cluster.local:3000/api/v1
+  api: https://git.unbound.se/api/v1
   download: https://gitea.unbound.se
 
 env: