Dependabot automerge (#12844)

Reduce toil. Will automerge patch and minor updates

Author: kyledurand

.github/workflows/changelog.yml

@@ -12,6 +12,7 @@ on:
 jobs:
   check:
     if: |
+      github.event.pull_request.user.login != 'dependabot[bot]' &&
       !contains(github.event.pull_request.head.ref, 'changeset-release') &&
       !contains(github.event.pull_request.labels.*.name, '🤖Skip Changelog')
     runs-on: ubuntu-latest

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

@@ -0,0 +1,24 @@
+name: Dependabot Auto-merge
+on: pull_request_target
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  dependabot:
+    runs-on: shopify-ubuntu-latest
+    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: dependabot-metadata
+        uses: dependabot/fetch-metadata@v2
+        with:
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
+
+      - name: Approve and /shipit Dependabot PRs for patch and minor versions
+        if: ${{ steps.dependabot-metadata.outputs.update-type != 'version-update:semver-major' }}
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}