Move Dependabot automerge behind completed required checks

.github/workflows/build-and-test.yml

@@ -55,14 +55,3 @@ jobs:
       run: dotnet publish IntelliTect.Multitool.AotTest/IntelliTect.Multitool.AotTest.csproj -r linux-x64 -c Release
     - name: Run AOT binary
       run: ./IntelliTect.Multitool.AotTest/bin/Release/net8.0/linux-x64/publish/IntelliTect.Multitool.AotTest
-
-  automerge:
-    needs: [build-and-test, aot-test]
-    runs-on: ubuntu-latest
-
-    permissions:
-      pull-requests: write
-      contents: write
-
-    steps:
-      - uses: fastify/github-action-merge-dependabot@v3.12.0  

.github/workflows/dependabot-automerge.yml

@@ -0,0 +1,24 @@
+name: Dependabot automerge
+
+on:
+  workflow_run:
+    workflows: [Build and Test]
+    types: [completed]
+
+jobs:
+  automerge:
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success' &&
+      github.event.workflow_run.actor.login == 'dependabot[bot]' &&
+      github.event.workflow_run.pull_requests[0].number != null
+    runs-on: ubuntu-latest
+
+    permissions:
+      pull-requests: write
+      contents: write
+
+    steps:
+      - uses: fastify/github-action-merge-dependabot@v3.12.0
+        with:
+          pr-number: ${{ github.event.workflow_run.pull_requests[0].number }}