Use mariadb 10.6 in CI build

Author: KarlLevik

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     services:
       mariadb:
-        image: mariadb:10.8
+        image: mariadb:10.6
         env:
           MYSQL_USER: test
           MYSQL_PASSWORD: test
@@ -28,7 +28,7 @@ jobs:
       - uses: shogo82148/actions-setup-mysql@v1
         with:
           distribution: 'mariadb'
-          mysql-version: '10.8'
+          mysql-version: '10.6'
           auto-start: false
       - name: Build database
         run: |