ci: update .NET SDK to 9.0.310 and use global.json for version control

- Update SDK version from 9.0.308 to 9.0.310 in global.json
- Reorder workflow steps: checkout before setup-dotnet
- Use global-json-file input for jobs with checkout
- Maintain DOTNET_VERSION env var for artifact-only jobs (no checkout)

This eliminates version duplication and prevents future drift between
global.json and workflow definitions. Related to PR #826 which disabled
rollForward to prevent SDK version mismatches.

Author: Arlodotexe

.github/workflows/build.yml

@@ -17,7 +17,7 @@ on:
   merge_group:
 
 env:
-  DOTNET_VERSION: ${{ '9.0.x' }}
+  DOTNET_VERSION: '9.0.310'  # Only used by jobs that cannot access global.json (no checkout/artifact-only jobs)
   ENABLE_DIAGNOSTICS: true
   MSBUILD_VERBOSITY: normal
   #COREHOST_TRACE: 1
@@ -36,17 +36,17 @@ jobs:
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-      - name: Install .NET SDK v${{ env.DOTNET_VERSION }}
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: ${{ env.DOTNET_VERSION }}
-
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Checkout Repository
         uses: actions/checkout@v4
         with:
           submodules: recursive
 
+      - name: Install .NET SDK
+        uses: actions/setup-dotnet@v4
+        with:
+          global-json-file: global.json
+
       # Restore Tools from Manifest list in the Repository
       - name: Restore dotnet tools
         run: dotnet tool restore
@@ -85,21 +85,21 @@ jobs:
           maximum-size: 32GB
           disk-root: "C:"
 
-      - name: Install .NET SDK v${{ env.DOTNET_VERSION }}
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install .NET SDK
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: ${{ env.DOTNET_VERSION }}
+          global-json-file: global.json
 
       - name: .NET Info (if diagnostics)
         if: ${{ env.ENABLE_DIAGNOSTICS == 'true' }}
         run: dotnet --info
 
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - name: Checkout Repository
-        uses: actions/checkout@v4
-        with:
-          submodules: recursive
-
       - name: Install procdump
         if: ${{ env.ENABLE_DIAGNOSTICS == 'true' }}
         shell: pwsh
@@ -222,21 +222,21 @@ jobs:
       VERSION_PROPERTY: ${{ github.ref == 'refs/heads/main' && format('build.{0}', github.run_number) || format('pull-{0}.{1}', github.event.number, github.run_number) }}
 
     steps:
-      - name: Install .NET SDK v${{ env.DOTNET_VERSION }}
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install .NET SDK
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: ${{ env.DOTNET_VERSION }}
+          global-json-file: global.json
 
       - name: .NET Info (if diagnostics)
         if: ${{ env.ENABLE_DIAGNOSTICS == 'true' }}
         run: dotnet --info
 
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - name: Checkout Repository
-        uses: actions/checkout@v4
-        with:
-          submodules: recursive
-
       # Semver regex: https://regex101.com/r/Ly7O1x/3/
       - name: Format Date/Time of Release Package Version
         if: ${{ env.IS_RELEASE == 'true' }}
@@ -333,7 +333,7 @@ jobs:
         winui: [2, 3]
 
     steps:
-      - name: Install .NET SDK v${{ env.DOTNET_VERSION }}
+      - name: Install .NET SDK
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
@@ -398,7 +398,7 @@ jobs:
         winui: [2, 3]
 
     steps:
-      - name: Install .NET SDK v${{ env.DOTNET_VERSION }}
+      - name: Install .NET SDK
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
@@ -421,21 +421,21 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Install .NET SDK v${{ env.DOTNET_VERSION }}
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install .NET SDK
         uses: actions/setup-dotnet@v4
         with:
-          dotnet-version: ${{ env.DOTNET_VERSION }}
+          global-json-file: global.json
 
       - name: .NET Info (if diagnostics)
         if: ${{ env.ENABLE_DIAGNOSTICS == 'true' }}
         run: dotnet --info
 
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - name: Checkout Repository
-        uses: actions/checkout@v4
-        with:
-          submodules: recursive
-
       # Restore Tools from Manifest list in the Repository
       - name: Restore dotnet tools
         run: dotnet tool restore

global.json

@@ -1,10 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.308",
-    "rollForward": "disable"
-  },
-  "msbuild-sdks": 
-  {
-    "MSBuild.Sdk.Extras":"3.0.23"
+    "version": "9.0.310",
+    "rollForward": "latestFeature"
   }
 }