feat(ci): autoformat commits

Author: LesnyRumcajs

.github/workflows/auto-format.yml

@@ -0,0 +1,49 @@
+# This workflow runs on every push and automatically applies formatting using mise format
+name: Auto-format code
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on:
+  push:
+    branches:
+      - "**"
+
+jobs:
+  format:
+    runs-on: ubuntu-24.04-arm
+    # Only run on the main repo, skip forks
+    # Skip if commit is already from this auto-format workflow to avoid infinite loops
+    if: github.repository == 'ChainSafe/forest' && !contains(github.event.head_commit.message, '[LeshyBot] Apply automatic formatting')
+    steps:
+      - uses: actions/create-github-app-token@v2
+        id: generate-token
+        with:
+          app-id: ${{ secrets.LESHY_APP_ID }}
+          private-key: ${{ secrets.LESHY_APP_PRIVATE_KEY }}
+
+      - uses: actions/checkout@v6
+        with:
+          token: ${{ steps.generate-token.outputs.token }}
+          fetch-depth: 0
+
+      - uses: jdx/mise-action@v3
+      - run: mise format
+
+      - name: Check for changes
+        id: check-changes
+        run: |
+          if [[ -n $(git status --porcelain) ]]; then
+            echo "has_changes=true" >> $GITHUB_OUTPUT
+          else
+            echo "has_changes=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Commit and push formatting changes
+        if: steps.check-changes.outputs.has_changes == 'true'
+        run: |
+          git config user.name "LeshyBot"
+          git add .
+          git commit -m "[LeshyBot] Apply automatic formatting"
+          git push