squash! Use gh CLI to get the PR diff

.github/workflows/changelogs.yml

@@ -48,9 +48,18 @@ jobs:
     name: Changelog tests
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-      with:
-        fetch-depth: 2
+    - name: Clone PR head branch
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        HEAD_REPO: ${{ github.event.pull_request.head.repo.clone_url }}
+        HEAD_BRANCH: ${{ github.event.pull_request.head.ref }}
+      run: |
+        echo "Cloning head branch from $HEAD_REPO"
+        git clone --depth 2 --branch $HEAD_BRANCH $HEAD_REPO uyuni
+        cd uyuni
+        echo $(pwd)
+        ls -R .
+        git log -1
     - id: master
       name: Get modified master changelog files
       uses: Ana06/get-changed-files@v2.3.0
@@ -68,24 +77,26 @@ jobs:
         echo
         echo "See https://github.com/uyuni-project/uyuni/wiki/Contributing for a guide to writing changelogs."
         exit 1
+    - id: files
+      name: Get changed files
+      uses: Ana06/get-changed-files@v2.3.0
     - name: Test changelog entries
       env:
         GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         BZ_TOKEN: ${{ secrets.BUGZILLA_TOKEN }}
       run: |
         pip install python-bugzilla~=3.2.0
 
-        CHANGED_FILES=$(gh pr diff -R ${{ github.event.pull_request.base.repo.full_name }} \
-            ${{ github.event.pull_request.number }} --name-only)
-        echo $CHANGED_FILES
+        echo "Changed files:"
+        echo ${{ steps.files.outputs.added_modified }}
 
         # Tracker file can be retrieved from the OBS/IBS API
         # by calling 'osc api /issue_trackers/' (with authentication)
         python .github/workflows/changelogs/changelogs.py -v \
             --tracker-file .github/workflows/changelogs/trackers.xml \
             --git-repo uyuni-project/uyuni \
             --pr-number ${{ github.event.pull_request.number }} \
-            $CHANGED_FILES
+            ${{ steps.files.outputs.added_modified }}
 
   # Warns the user if they merged the PR, but the changelog test failed
   warn_user_if_merged: