break-pacman-upload-lease: use actions/checkout

There is no need to roll our own `git clone`, and while at it, do clone
into the current directory; We're on Linux, after all, and cannot just
write to `/usr/src/` as we would in a Git for Windows SDK.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/workflows/break-pacman-upload-lease.yml

@@ -9,8 +9,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone build-extra
-        shell: bash
-        run: git clone --depth 1 --single-branch -b main https://github.com/git-for-windows/build-extra /usr/src/build-extra
+        uses: actions/checkout@v4
+        with:
+          repository: git-for-windows/build-extra
 
       - name: Prepare home directory
         if: env.AZURE_BLOBS_TOKEN != ''
@@ -26,4 +27,5 @@ jobs:
         shell: bash
         env:
           AZURE_BLOBS_TOKEN: ${{secrets.AZURE_BLOBS_TOKEN}}
-        run: /usr/src/build-extra/pacman-helper.sh break_lock
+        run: |
+          ./pacman-helper.sh break_lock