add action

action.yml

@@ -0,0 +1,23 @@
+name: 'Checkout'
+description: 'Checkout a Git repository at a particular version'
+inputs:
+  repository:
+    description: 'Repository name with owner. For example, actions/checkout'
+    default: ${{ gitlab.repository }}
+  token:
+    description: >
+      Personal access token (PAT) used to fetch the repository. The PAT is configured
+      with the local git config, which enables your scripts to run authenticated git
+      commands. The post-job step removes the PAT.
+      We recommend using a service account with the least permissions necessary.
+      Also when generating a new PAT, select the least scopes necessary.
+      [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)
+    default: ${{ github.token }}
+
+runs:
+  using: "composite"
+  steps:
+    - id: checkout repo
+      run: |
+        cd $GITHUB_WORKSPACE
+        git clone https://${GITHUB_ACTOR}:${inputs.token}@${GITHUB_SERVER_URL}/${inputs.repository}