feat: add gitea/forgejo support

src/formatters/helpers.ts

@@ -23,3 +23,14 @@ export function buildMessage(
     timestamp: partial.timestamp ?? new Date().toISOString(),
   };
 }
+
+/**
+ * Base URL of the forge repo (e.g. `https://github.com/owner/repo` or a Gitea
+ * instance URL). Derived from `repository.html_url` in the payload so it works
+ * for any provider; falls back to github.com for legacy payloads.
+ */
+export function repoBaseUrl(payload: Record<string, unknown>, repo?: string): string | undefined {
+  const html = (payload.repository as { html_url?: string } | undefined)?.html_url;
+  if (html) return html;
+  return repo ? `https://github.com/${repo}` : undefined;
+}