Bump dotnet SDK to 7.0.100-preview.4.22252.9 (#2359)

And stop explicitly specifying the version in our CI workflow
(use global.json)

.github/workflows/build.yml

@@ -11,7 +11,6 @@ on:
   pull_request:
 
 env:
-  dotnet_sdk_version: '7.0.100-preview.3.22179.4'
   postgis_version: 3
   DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
 
@@ -47,8 +46,6 @@ jobs:
 
       - name: Setup .NET Core SDK
         uses: actions/setup-dotnet@v2
-        with:
-          dotnet-version: ${{ env.dotnet_sdk_version }}
 
       - name: Build
         run: dotnet build --configuration Debug
@@ -143,8 +140,6 @@ jobs:
 
       - name: Setup .NET Core SDK
         uses: actions/setup-dotnet@v2
-        with:
-          dotnet-version: ${{ env.dotnet_sdk_version }}
 
       - name: Pack
         run: dotnet pack --configuration Release --output nupkgs --version-suffix "ci.$(date -u +%Y%m%dT%H%M%S)+sha.${GITHUB_SHA:0:9}" -p:ContinuousIntegrationBuild=true
@@ -177,8 +172,6 @@ jobs:
 
       - name: Setup .NET Core SDK
         uses: actions/setup-dotnet@v2
-        with:
-          dotnet-version: ${{ env.dotnet_sdk_version }}
 
       - name: Pack
         run: dotnet pack --configuration Release --output nupkgs -p:ContinuousIntegrationBuild=true

Directory.Packages.props

@@ -22,7 +22,7 @@
 
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
-    <PackageVersion Include="xunit" Version="2.4.2-pre.22" />
+    <PackageVersion Include="xunit" Version="2.4.2-pre.9" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.4.5" />
     <PackageVersion Include="GitHubActionsTestLogger" Version="1.4.1" />
   </ItemGroup>

NuGet.config

@@ -6,4 +6,28 @@
         <add key="npgsql-vnext" value="https://www.myget.org/F/npgsql-vnext/api/v3/index.json" />
         <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
     </packageSources>
+
+    <packageSourceMapping>
+        <packageSource key="npgsql-vnext">
+            <package pattern="Npgsql.*" />
+        </packageSource>
+        <packageSource key="dotnet7">
+            <package pattern="*" />
+        </packageSource>
+        <packageSource key="dotnet-eng">
+            <!-- EF Core depends on xunit 2.4.2-pre.9 which is only in dotnet-eng.
+                 But some xunit packages still need to come from nuget.org, so we cherry-pick. -->
+            <package pattern="xunit" />
+            <package pattern="xunit.assert" />
+            <package pattern="xunit.core" />
+            <package pattern="xunit.extensibility.core" />
+            <package pattern="xunit.extensibility.execution" />
+        </packageSource>
+        <packageSource key="nuget.org">
+            <package pattern="*" />
+            <!-- Our npgsql-vnext feed doesn't necessarily contain the last preview (package retention rules...), so we take it from nuget.org -->
+            <package pattern="Npgsql.*" />
+        </packageSource>
+    </packageSourceMapping>
+
 </configuration>

global.json

 {
   "sdk": {
-    "version": "7.0.100-preview.3.22179.4",
+    "version": "7.0.100-preview.4.22252.9",
     "rollForward": "latestMajor",
     "allowPrerelease": "true"
   }