ci: add dco workaround, run tests for merge queues

.github/workflows/dco-merge-group.yml

@@ -0,0 +1,12 @@
+name: DCO
+on:
+  merge_group:
+
+# Workaround because the DCO app doesn't run on a merge_group trigger
+# https://github.com/dcoapp/app/pull/200
+jobs:
+  DCO:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor != 'renovate[bot]' }}
+    steps:
+      - run: echo "dummy DCO workflow (it won't run any check actually) to trigger by merge_group in order to enable merge queue"

.github/workflows/pr-checks.yml

@@ -4,11 +4,14 @@ on:
   push:
     branches:
       - main
-    paths-ignore:
-      - '**.md'
   pull_request:
-    paths-ignore:
-      - '**.md'
+    types:
+      - opened
+      - synchronize
+      - reopened
+    branches:
+      - main
+  merge_group:
 
 permissions:
   contents: read