Adds automerge script

#234

.github/dependabot.yml

@@ -7,3 +7,6 @@ updates:
       interval: daily
       time: '04:00'
     open-pull-requests-limit: 100
+    labels:
+      - "dependencies"
+      - "automerge"

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

@@ -0,0 +1,28 @@
+name: Enables auto-merge on dependency pull requests
+on:
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch: {}
+
+jobs:
+  enable-automerge:
+    if: |
+      contains(github.event.pull_request.labels.*.name, 'automerge')
+      && 
+        contains(github.event.pull_request.labels.*.name, 'dependencies')
+      && (
+        contains(github.event.pull_request.labels.*.name, 'minor')
+        || contains(github.event.pull_request.labels.*.name, 'patch')
+      )
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Enable auto-merge
+        run: |
+          gh pr merge --auto --squash "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}