chore: Dependabot grouping + ignore-major + auto-merge (#4)

* chore: group minor/patch + ignore major version-updates

* ci: auto-merge Dependabot minor/patch

Author: pocketrocket

.github/dependabot.yml

@@ -8,3 +8,7 @@ updates:
       - "dependencies"
     commit-message:
       prefix: "chore"
+    groups:
+      github-actions:
+        patterns:
+          - "*"

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

@@ -0,0 +1,24 @@
+name: Dependabot auto-merge
+
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  auto-merge:
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch metadata
+        id: meta
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Auto-merge minor & patch
+        if: ${{ steps.meta.outputs.update-type == 'version-update:semver-minor' || steps.meta.outputs.update-type == 'version-update:semver-patch' }}
+        run: gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}