Docker: Clone base branch instead of selective files (#21317)

* clone base branch instead of selective files

.github/workflows/staging-deploy-pr-docker.yml

@@ -12,8 +12,6 @@ on:
       - completed
 
 env:
-  EARLY_ACCESS_SCRIPT_PATH: script/early-access/clone-for-build.js
-  EARLY_ACCESS_SUPPORT_FILES: script/package.json
   # In this specific workflow relationship, the `github.event.workflow_run.pull_requests`
   # array will always contain only 1 item! Specifically, it will contain the PR associated
   # with the `github.event.workflow_run.head_branch` that triggered the preceding
@@ -43,6 +41,9 @@ jobs:
           GITHUB_EVENT_CONTEXT: ${{ toJSON(github.event) }}
         run: echo "$GITHUB_EVENT_CONTEXT"
 
+      - name: Check out repo's default branch
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f
+
       - name: Download build artifact
         uses: dawidd6/action-download-artifact@b9571484721e8187f1fd08147b497129f8972c74
         with:
@@ -69,13 +70,6 @@ jobs:
           node-version: 16.x
           cache: npm
 
-      - if: ${{ github.repository == 'github/docs-internal' }}
-        name: Download the script to clone early access
-        uses: Bhacaz/checkout-files@c8f01756bfd894ba746d5bf48205e19000b0742b
-        with:
-          files: ${{ env.EARLY_ACCESS_SCRIPT_PATH }} ${{ env.EARLY_ACCESS_SUPPORT_FILES }}
-          token: ${{ secrets.GITHUB_TOKEN }}
-
       # Add any dependencies that are needed for this workflow below
       - if: ${{ github.repository == 'github/docs-internal' }}
         name: Install temporary development-only dependencies
@@ -83,7 +77,7 @@ jobs:
 
       - if: ${{ github.repository == 'github/docs-internal' }}
         name: Clone early access
-        run: node ${{ env.EARLY_ACCESS_SCRIPT_PATH }}
+        run: node script/early-access/clone-for-build.js
         env:
           DOCUBOT_REPO_PAT: ${{ secrets.DOCUBOT_REPO_PAT }}
           GIT_BRANCH: ${{ github.event.workflow_run.head_branch }}