WIP: mysql8 pipeline

.docker/Dockerfile

-FROM mysql:8
+FROM debian:buster
 RUN apt-get update \
     && \
     apt-get install -y \

.gitlab-ci.yml

@@ -20,7 +20,7 @@
 #
 
 services:
-  - mariadb:10.4
+  - mysql:8
 variables:
   DEPLOY_REF: dev
   CI_REGISTRY_IMAGE: $CI_REGISTRY/caosdb/src/caosdb-mysqlbackend/testenv:latest
@@ -52,7 +52,7 @@ unittests:
     - cp config.defaults .config
     - echo 'DATABASE_USER_HOST_LIST="%,"' >> .config
     - echo "MYSQL_USER_PASSWORD=$MYSQL_ROOT_PASSWORD" >> .config
-    - echo "MYSQL_HOST=mariadb" >> .config
+    - echo "MYSQL_HOST=mysql" >> .config
     - sleep 10
     - make install
     - ./utils/make_db restore_db tests/example.dump.sql