ci: Unconditionally set the global git author name in cirrys.yml

The author is also needed for the verify-commits.py script.

.cirrus.yml

@@ -21,11 +21,13 @@ persistent_worker_template: &PERSISTENT_WORKER_TEMPLATE
 base_template: &BASE_TEMPLATE
   skip: $CIRRUS_REPO_FULL_NAME == "bitcoin-core/gui" && $CIRRUS_PR == ""  # No need to run on the read-only mirror, unless it is a PR. https://cirrus-ci.org/guide/writing-tasks/#conditional-task-execution
   merge_base_script:
+    # Unconditionally install git (used in fingerprint_script) and set the
+    # default git author name (used in verify-commits.py)
     - bash -c "$PACKAGE_MANAGER_INSTALL git"
-    - if [ "$CIRRUS_PR" = "" ]; then exit 0; fi
-    - git fetch $CIRRUS_REPO_CLONE_URL $CIRRUS_BASE_BRANCH
     - git config --global user.email "[email protected]"
     - git config --global user.name "ci"
+    - if [ "$CIRRUS_PR" = "" ]; then exit 0; fi
+    - git fetch $CIRRUS_REPO_CLONE_URL $CIRRUS_BASE_BRANCH
     - git merge FETCH_HEAD  # Merge base to detect silent merge conflicts
   stateful: false  # https://cirrus-ci.org/guide/writing-tasks/#stateful-tasks