ci: add Dependabot auto-merge workflow

Co-authored-by: Rushaway <[email protected]>

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       CXX: "clang++-14"
     steps:
       - name: Checkout repository with submodules
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           submodules: recursive
 
@@ -52,7 +52,7 @@ jobs:
     runs-on: windows-2022
     steps:
       - name: Checkout repository with submodules
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           submodules: recursive
 

.github/workflows/dependabot-auto-merge.yml

@@ -0,0 +1,24 @@
+name: Dependabot auto-merge
+
+on:
+  pull_request_target:
+    branches:
+      - master
+      - main
+    types:
+      - opened
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  enableAutoMerge:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.user.login == 'dependabot[bot]'
+    steps:
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}