fix: not open add changeset url on specific environment (#137)

Co-authored-by: JounQin <admin@1stg.me>

Author: angleshe

.changeset/green-ducks-yawn.md

@@ -0,0 +1,5 @@
+---
+"changesets-gitlab": patch
+---
+
+fix: not open add changeset url on specific environment

src/comment.ts

@@ -199,7 +199,7 @@ export const comment = async () => {
  }),
  ] as const)
 
- const addChangesetUrl = `${CI_MERGE_REQUEST_PROJECT_URL!}/new/${mrBranch}?file_name=.changeset/${humanId(
+ const addChangesetUrl = `${CI_MERGE_REQUEST_PROJECT_URL!}/-/new/${mrBranch}?file_name=.changeset/${humanId(
  {
  separator: '-',
  capitalize: false,