Grafana: Upgrades mysql images from 5.7 to 8 (#67604)

adds mysql integration build step for mysql 8

devenv/docker/blocks/mysql/.env

@@ -1 +1 @@
-mysql_version=5.7.39
+mysql_version=8.0.32

devenv/docker/blocks/mysql_tests/.env

@@ -1 +1 @@
-mysql_version=5.7.39
+mysql_version=8.0.32

devenv/docker/blocks/mysql_tests/Dockerfile

@@ -1,4 +1,4 @@
-ARG mysql_version=5.7.39
+ARG mysql_version=8.0.32
 FROM mysql:${mysql_version}
 ADD setup.sql /docker-entrypoint-initdb.d
 RUN chown -R mysql:mysql /docker-entrypoint-initdb.d/

devenv/docker/ha-test-unified-alerting/docker-compose.yaml

@@ -2,7 +2,7 @@ version: "2.1"
 
 services:
   db:
-    image: mysql:5.7.39
+    image: mysql:8.0.32
     platform: linux/x86_64
     environment:
       MYSQL_ROOT_PASSWORD: rootpass

devenv/docker/ha_test/docker-compose.yaml

@@ -16,7 +16,7 @@ services:
         tag: nginx
 
   db:
-    image: mysql:5.7.39
+    image: mysql:8.0.32
     environment:
       MYSQL_ROOT_PASSWORD: rootpass
       MYSQL_DATABASE: grafana