fix syntax, remove mariadb build test

.github/workflows/test_mariadb.yml

@@ -1,32 +0,0 @@
-name: Gradido MariaDB Test CI
-
-on: push
-
-jobs:
-  files-changed:
-    name: Detect File Changes - MariaDB
-    runs-on: ubuntu-latest
-    outputs:
-      mariadb: ${{ steps.changes.outputs.mariadb }}
-    steps:
-      - uses: actions/checkout@v3.3.0
-
-      - name: Check for frontend file changes
-        uses: dorny/paths-filter@v2.11.1
-        id: changes
-        with:
-          token: ${{ github.token }}
-          filters: .github/file-filters.yml
-          list-files: shell
-
-  build_test:
-    if: needs.files-changed.outputs.mariadb == 'true'
-    name: Docker Build Test - MariaDB
-    needs: files-changed
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v3
-
-      - name: MariaDB | Build 'test' image
-        run: docker build --target mariadb_server -t "gradido/mariadb:test" -f ./mariadb/Dockerfile ./

docker-compose.yml

@@ -61,8 +61,7 @@ services:
   ## MARIADB ##############################################
   #########################################################
   mariadb:
-    build:
-      mariadb:10.5
+    image: mariadb:10.5
     environment:
       - MARIADB_ALLOW_EMPTY_ROOT_PASSWORD=1
       - MARIADB_USER=root