Refactor GitHub Actions workflow for generating contribution snake by improving step organization and replacing the push action with a custom script

.github/workflows/snake.yml

@@ -2,28 +2,32 @@ name: Generate Contribution Snake
 
 on:
   schedule:
-    - cron: "0 0 * * *"   # Runs every day at midnight
-  workflow_dispatch:       # Allow manual runs
+    - cron: "0 0 * * *"   # Runs daily at midnight
+  workflow_dispatch:
 
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write   # 👈 ensures this job can push
     steps:
-      # 1. Checkout repo
       - name: Checkout repository
         uses: actions/checkout@v3
 
-      # 2. Generate snake SVG
       - name: Generate Snake
         uses: Platane/snk/svg-only@v3
         with:
           github_user_name: Alvin-Zilverstand
           outputs: dist/snake.svg
 
-      # 3. Push generated snake to output branch
-      - name: Push Snake to output branch
-        uses: EndBug/add-and-commit@v9
-        with:
-          add: "dist/snake.svg"
-          new_branch: output
-          message: "chore: update snake animation"
+      - name: Commit and push snake.svg to output branch
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git checkout --orphan output
+          git reset
+          mkdir -p dist
+          cp dist/snake.svg snake.svg
+          git add snake.svg
+          git commit -m "chore: update snake animation"
+          git push -f origin output