Adding missing setups of dotnet.

Author: renemadsen

.github/workflows/dotnet-core-docker.yml

@@ -500,6 +500,10 @@ jobs:
       run: |
         docker pull mariadb:10.8
         docker run --name mariadbtest --network data -e MYSQL_ROOT_PASSWORD=secretpassword -p 3306:3306 -d mariadb:10.8
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 9.0.x
     - name: Sleep 15 seconds
       run: sleep 15
     - name: Build
@@ -661,6 +665,10 @@ jobs:
       run: |
         docker pull mariadb:10.8
         docker run --name mariadbtest --network data -e MYSQL_ROOT_PASSWORD=secretpassword -p 3306:3306 -d mariadb:10.8
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 9.0.x
     - name: Sleep 15 seconds
       run: sleep 15
     - name: Load DB dump