Update workflows and add dependabot auto-merge

.github/dependabot.yml

@@ -5,11 +5,15 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    assignees:
+      - ylabonte
 
   - package-ecosystem: "pip"
     directory: "/"
     schedule:
       interval: "weekly"
     ignore:
       # Dependabot should not update Home Assistant as that should match the homeassistant key in hacs.json
-      - dependency-name: "homeassistant"
+      - dependency-name: "homeassistant"
+    assignees:
+      - ylabonte

.github/workflows/automerge.yml

@@ -0,0 +1,27 @@
+name: "Auto-Merge Dependabot PRs"
+
+on:
+  pull_request:
+    branches:
+      - "master"
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  automerge:
+    name: "Auto-approve PR"
+    runs-on: ubuntu-latest
+    if: github.actor == 'dependabot[bot]' || github.actor == 'ylabonte'
+    steps:
+      - name: "Approve PR to enable auto-merge"
+        run: gh pr review --approve "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
+      - name: "Auto-merge PR"
+        run: gh pr merge --merge --auto "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}