🧪Reuse existing action checkout as trampoline

Previously, the action repository was being cloned from the remote
twice, unnecessarily. This patch attempts to eliminate this step and
use the copy that was checked out on job start.

Author: webknjaz

action.yml

@@ -130,12 +130,6 @@ runs:
       PR_REF: ${{ github.event.pull_request.head.ref }}
       PR_REPO: ${{ github.event.pull_request.head.repo.full_name }}
       PR_REPO_ID: ${{ github.event.pull_request.base.repo.id }}
-  - name: Check out action repo
-    uses: actions/checkout@v4
-    with:
-      path: action-repo
-      ref: ${{ steps.set-repo-and-ref.outputs.ref }}
-      repository: ${{ steps.set-repo-and-ref.outputs.repo }}
   - name: Create Docker container action
     run: |
       # Create Docker container action
@@ -145,9 +139,9 @@ runs:
       REPO: ${{ steps.set-repo-and-ref.outputs.repo }}
       REPO_ID: ${{ steps.set-repo-and-ref.outputs.repo-id }}
     shell: bash
-    working-directory: action-repo
+    working-directory: ${{ github.action_path }}
   - name: Run Docker container
-    uses: ./action-repo/.github/actions/run-docker-container
+    uses: ${{ github.action_path }}/.github/actions/run-docker-container
     with:
       user: ${{ inputs.user }}
       password: ${{ inputs.password }}