How much WTFery do we need here

https://docs.github.com/en/actions/using-containerized-services/about-service-containers

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     name: Check MySQL connection
     runs-on: ubuntu-latest
     services:
-      mysql:
+      custom-mysql:
         image: mysql:5.7
         ports:
           - 3306:3306