mirroring of a pull requests fails

[kofemann]

Really nice action. A tiny fix will make it great.

action configuration

name: Mirror and run GitLab CI

on:
  push:
  pull_request:
    types: [opened, reopened]

jobs:
  to_gitlab:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Mirror + trigger CI
        uses: SvanBoxel/[email protected]
        with:
          args: "https://gitlaxxxxxe"
        env:
          FOLLOW_TAGS: "true"
          FORCE_PUSH: "false"
          GITLAB_HOSTNAME: "gilabxxxxxe"
          GITLAB_USERNAME: "dxxx"
          GITLAB_PASSWORD: ${{ secrets.GITLAB_PASSWORD }}
          GITLAB_PROJECT_ID: "21"
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          POLL_TIMEOUT: 60

Failure:

Run SvanBoxel/[email protected]
/usr/bin/docker run --name cabce3406b7a1ed5c4ba2a5ef1847791adb27_379d96 --label 1cabce --workdir /github/workspace --rm -e "FOLLOW_TAGS" -e "FORCE_PUSH" -e "GITLAB_HOSTNAME" -e "GITLAB_USERNAME" -e "GITLAB_PASSWORD" -e "GITLAB_PROJECT_ID" -e "GITHUB_TOKEN" -e "POLL_TIMEOUT" -e "INPUT_ARGS" -e "HOME" -e "GITHUB_JOB" -e "GITHUB_REF" -e "GITHUB_SHA" -e "GITHUB_REPOSITORY" -e "GITHUB_REPOSITORY_OWNER" -e "GITHUB_REPOSITORY_OWNER_ID" -e "GITHUB_RUN_ID" -e "GITHUB_RUN_NUMBER" -e "GITHUB_RETENTION_DAYS" -e "GITHUB_RUN_ATTEMPT" -e "GITHUB_REPOSITORY_ID" -e "GITHUB_ACTOR_ID" -e "GITHUB_ACTOR" -e "GITHUB_TRIGGERING_ACTOR" -e "GITHUB_WORKFLOW" -e "GITHUB_HEAD_REF" -e "GITHUB_BASE_REF" -e "GITHUB_EVENT_NAME" -e "GITHUB_SERVER_URL" -e "GITHUB_API_URL" -e "GITHUB_GRAPHQL_URL" -e "GITHUB_REF_NAME" -e "GITHUB_REF_PROTECTED" -e "GITHUB_REF_TYPE" -e "GITHUB_WORKFLOW_REF" -e "GITHUB_WORKFLOW_SHA" -e "GITHUB_WORKSPACE" -e "GITHUB_ACTION" -e "GITHUB_EVENT_PATH" -e "GITHUB_ACTION_REPOSITORY" -e "GITHUB_ACTION_REF" -e "G
error: pathspec '7667/merge' did not match any file(s) known to git
fatal: ref HEAD is not a symbolic ref
/entrypoint.sh: line 7: 1: unbound variable

related issue: #27