ci: format bazel build files + format checker (#1424)

* ci: format bazel build files + format checker

* Apply suggestions from code review

Co-authored-by: Mosè Giordano <[email protected]>

---------

Co-authored-by: Mosè Giordano <[email protected]>

Author: avik-pal

.github/workflows/format-check-bazel.yml

@@ -0,0 +1,17 @@
+name: Bazel files check
+
+on: [push]
+
+jobs:
+  formatting-check:
+    name: Formatting Bazel files check
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Setup buildifier
+      uses: jbajic/setup-buildifier@v1
+
+    - name: Run buildifier
+      run: |
+        buildifier -mode check -r .

.github/workflows/format-pr-bazel.yml

@@ -0,0 +1,37 @@
+name: Bazel files auto format
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+jobs:
+  formatting-check:
+    name: Formatting Bazel files check
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Setup buildifier
+      uses: jbajic/setup-buildifier@v1
+
+    - name: Run buildifier
+      run: |
+        buildifier -r .
+
+    - name: Create Pull Request
+      id: cpr
+      uses: peter-evans/create-pull-request@v7
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        commit-message: Format code
+        title: 'Format code of branch "main"'
+        branch: format-main
+        delete-branch: true
+        labels: format
+        author: enzyme-ci-bot[bot] <78882869+enzyme-ci-bot[bot]@users.noreply.github.com>
+
+    - name: Check outputs
+      run: |
+        echo "Pull Request Number - ${{ steps.cpr.outputs.pull-request-number }}"
+        echo "Pull Request URL - ${{ steps.cpr.outputs.pull-request-url }}"