Configure Dependabot auto-merge to develop

.github/dependabot.yml

@@ -3,6 +3,7 @@ updates:
   # Maintain dependencies for Cargo (Rust packages)
   - package-ecosystem: "cargo"
     directory: "/"
+    target-branch: "develop"
     schedule:
       interval: "weekly"
       day: "monday"
@@ -30,6 +31,7 @@ updates:
   # Maintain dependencies for GitHub Actions
   - package-ecosystem: "github-actions"
     directory: "/"
+    target-branch: "develop"
     schedule:
       interval: "weekly"
       day: "monday"

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

@@ -0,0 +1,30 @@
+name: Dependabot Auto-Merge
+
+on:
+  pull_request_target:
+    types:
+      - opened
+      - reopened
+      - synchronize
+
+permissions:
+  contents: write
+  pull-requests: write
+  checks: read
+
+jobs:
+  enable-auto-merge:
+    if: >-
+      ${{ github.actor == 'dependabot[bot]' &&
+          github.event.pull_request.base.ref == 'develop' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch Dependabot metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1
+
+      - name: Enable auto-merge
+        uses: peter-evans/enable-pull-request-automerge@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          merge-method: squash