add auto-format action to CI

Author: ekump

.github/workflows/all-checks.yml

@@ -16,4 +16,4 @@ jobs:
                 delay: '3'
                 retries: '45'
                 polling_interval: '1'
-                checks_exclude: 'devflow/merge,dd-gitlab/default-pipeline'
+                checks_exclude: 'devflow/merge,dd-gitlab/default-pipeline,Rustfmt Auto / rustfmt'

.github/workflows/rustfmt-auto.yml

@@ -0,0 +1,21 @@
+name: Rustfmt Auto
+on:
+  pull_request:
+
+jobs:
+  rustfmt:
+    runs-on: ubuntu-latest
+    if: ${{ !startsWith(github.head_ref, 'mq-working-branch') }}
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # 4.2.2
+        with:
+          ref: ${{ github.head_ref }}
+      - name: Install nightly-2026-02-08 toolchain and rustfmt
+        run: rustup install nightly-2026-02-08 && rustup default nightly-2026-02-08 && rustup component add rustfmt
+      - name: Run rustfmt and commit changes
+        uses: mbrobbel/rustfmt-check@e7ac5685995bd39fb14f6c83fa6f10627e92e680 # master
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}