ci: latest mysql 5.7 container image removed /etc/mysql/mysql.conf.d,…

… remove our workaround for setting the socket path

with docker-library/mysql#867 images without distro tag are now built on oracle linux by default.
this change removed /etc/mysql/mysql.conf.d from the image, see also docker-library/mysql#876.
this also means we no longer need to work around the socket path being overridden in another config file and we can use the same logic as on all other images.

.github/workflows/ci-cd.yml

@@ -584,13 +584,7 @@ jobs:
         # we need to ensure that the socket path is writable for the user running the DB process in the container
         sudo chmod 0777 /tmp/run-${{ join(matrix.db, '-') }}
 
-        # mysql 5.7 container overrides the socket path in /etc/mysql/mysql.conf.d/mysqld.cnf
-        if [ "${{ join(matrix.db, '-') }}" = "mysql-5.7" ]
-        then
-          docker container cp "${{ github.workspace }}/tests/ssl_resources/socket.cnf" mysqld:/etc/mysql/mysql.conf.d/zz-aiomysql-socket.cnf
-        else
-          docker container cp "${{ github.workspace }}/tests/ssl_resources/socket.cnf" mysqld:/etc/mysql/conf.d/aiomysql-socket.cnf
-        fi
+        docker container cp "${{ github.workspace }}/tests/ssl_resources/socket.cnf" mysqld:/etc/mysql/conf.d/aiomysql-socket.cnf
 
         docker container start mysqld