add write permission for workflow

Author: Smaran-Teja

.github/workflows/plot.yml

@@ -5,6 +5,10 @@ on:
     branches:
       - master
 
+permissions:
+  contents: write   # required for pushing commits
+
+
 jobs:
   generate-timing-plots:
     runs-on: ubuntu-latest
@@ -28,5 +32,5 @@ jobs:
           git config --global user.name 'github-actions[bot]'
           git config --global user.email 'github-actions[bot]@users.noreply.github.com'
           git add .
-          git commit -m "Update timing plots"
+          git commit -m "Update timing plots [skip ci]" || echo "No changes to commit"
           git push