ci: determine commit author correctly for scheduled workflow

Author: ishabaral

.github/workflows/gui-tests.yml

@@ -168,6 +168,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v6
+        with:
+          fetch-depth: 1
 
       - name: notify-matrix
         env:

test/gui/ci/notification_template.sh

@@ -11,7 +11,16 @@ TEST_LOGS=""
 BRANCH_NAME="${GITHUB_REF_NAME}"
 ROOMID="!rnWsCVUmDHDJbiSPMM:matrix.org"
 
-COMMIT_AUTHOR=$(git log -1 --pretty=format:'%an' 2>/dev/null)
+if [ "$GITHUB_EVENT_NAME" = "schedule" ]; then
+    git fetch origin $GITHUB_REF_NAME --depth=1 2>/dev/null || true
+    COMMIT_AUTHOR=$(git log -1 --pretty=format:'%an' 2>/dev/null)
+else
+    COMMIT_AUTHOR="${GITHUB_EVENT_HEAD_COMMIT_AUTHOR_NAME:-}"
+    if [ -z "$COMMIT_AUTHOR" ]; then
+        COMMIT_AUTHOR=$(git log -1 --pretty=format:'%an' 2>/dev/null)
+    fi
+fi
+
 
 if [ "${GITHUB_BUILD_STATUS}" == "failure" ]; then
     BUILD_STATUS="❌️ Failure"