.github/workflows/xfstests: Limit github actions to set branches

Currently github actions will run for push & pull to any branch for
changes in fs/xfstests.py*. Instead
- limit it to master branch for pull requests.
- limit it to xfstestci* branch for any push request.

Signed-off-by: Ritesh Harjani (IBM) <[email protected]>

Author: riteshharjani

.github/workflows/xfstests.yaml

@@ -3,14 +3,14 @@ name: xfstests
 on:
   push:
     branches:
-      - '**'
+      - 'xfstestsci**'
     paths:
       - 'fs/xfstests.py'
       - 'fs/xfstests.py.data/*/ci.yaml'
       - '.github/workflows/xfstests.yaml'
   pull_request:
     branches:
-      - '**'
+      - 'master'
     paths:
       - 'fs/xfstests.py'
       - 'fs/xfstests.py.data/*/ci.yaml'