Docker compose and pre-release tests to net 8 (#618)

* docker to net 8

* pre-release test to net 8

Author: danFbach

Diff for: .github/workflows/pre-release-tests.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: 3.1.101
+          dotnet-version: 8.x
       - name: Get the latest Meilisearch RC
         run: echo "MEILISEARCH_VERSION=$(curl https://raw.githubusercontent.com/meilisearch/integration-guides/main/scripts/get-latest-meilisearch-rc.sh | bash)" >> $GITHUB_ENV
       - name: Meilisearch (${{ env.MEILISEARCH_VERSION }}) setup with Docker

Diff for: docker-compose.yml

@@ -5,7 +5,7 @@ volumes:
 
 services:
   package:
-    image: mcr.microsoft.com/dotnet/sdk:6.0
+    image: mcr.microsoft.com/dotnet/sdk:8.0
     tty: true
     stdin_open: true
     working_dir: /home/package