ci: add checks

Signed-off-by: black-desk <me@black-desk.cn>

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+    - directory: /
+      package-ecosystem: gitsubmodule
+      schedule:
+        interval: daily
+    - directory: /
+      package-ecosystem: github-actions
+      schedule:
+        interval: daily

.github/workflows/checks.yaml

@@ -0,0 +1,26 @@
+name: Checks
+
+on: [pull_request]
+
+jobs:
+  checks:
+    name: Common checks
+    permissions:
+      contents: read
+      checks: write
+      issues: write
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: black-desk/checks@v1
+  pass:
+    name: Pass
+    if: always()
+    needs:
+      - checks
+    runs-on: ubuntu-latest
+    steps:
+      - name: Decide whether the needed jobs succeeded or failed
+        uses: re-actors/alls-green@release/v1
+        with:
+          jobs: ${{ toJSON(needs) }}

.gitmodules

@@ -0,0 +1,3 @@
+[submodule ".format"]
+	path = .format
+	url = https://github.com/black-desk/.format