Add multi-version .NET Copilot workflow with deterministic package restoration

.github/workflows/copilot-setup-steps.yml

@@ -0,0 +1,70 @@
+name: Copilot Setup Steps for Multi-Version .NET
+
+# Trigger the workflow on multiple events for validation and manual execution
+on:
+  # Allow manual triggering from the Actions tab
+  workflow_dispatch:
+  # Run on push to validate workflow changes
+  push:
+    paths:
+      - '.github/workflows/copilot-setup-steps.yml'
+  # Run on pull request to validate workflow changes
+  pull_request:
+    paths:
+      - '.github/workflows/copilot-setup-steps.yml'
+
+# Set minimum required permissions for security best practices
+# Only grant read access to repository contents
+permissions:
+  contents: read
+
+jobs:
+  # Job name must be 'copilot-setup-steps' to be recognized by GitHub Copilot
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+
+    steps:
+      # Checkout with full history for proper git operations
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      # Setup multiple .NET SDK versions in a single step using multi-version syntax
+      # Using specific version numbers for reproducibility (not wildcards)
+      # Includes NuGet package caching with lock files for performance optimization
+      - name: Setup .NET SDKs (6.0, 8.0, 10.0)
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            6.0.428
+            8.0.416
+            10.0.101
+          # Enable NuGet package caching for faster builds
+          cache: true
+          # Use packages.lock.json files for cache dependency tracking
+          cache-dependency-path: '**/packages.lock.json'
+
+      # Set up .NET environment variables for optimal performance and privacy
+      - name: Configure .NET environment variables
+        run: |
+          echo "DOTNET_ROOT=$HOME/.dotnet" >> $GITHUB_ENV
+          echo "DOTNET_CLI_TELEMETRY_OPTOUT=1" >> $GITHUB_ENV
+          echo "DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1" >> $GITHUB_ENV
+          echo "DOTNET_NOLOGO=1" >> $GITHUB_ENV
+
+      # Restore dependencies with locked mode to ensure deterministic package versions
+      # This requires packages.lock.json files to exist in each project
+      - name: Restore dependencies with lock files
+        run: dotnet restore --locked-mode
+
+      # Note: dotnet format is built into .NET SDK 6+ and available via 'dotnet format' command
+      # No separate installation is needed as it's included with the SDKs we've installed above
+
+      # Validate that the setup works by building all projects
+      - name: Build validation
+        run: dotnet build --no-restore --configuration Release
+
+      # Display installed .NET versions for verification
+      - name: Display .NET versions
+        run: dotnet --list-sdks

samples/UniqueIdMaker/UniqueIdMaker.csproj

@@ -6,6 +6,7 @@
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
     <LangVersion>10</LangVersion>
+    <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
   </PropertyGroup>
 
   <ItemGroup>

samples/UniqueIdMaker/packages.lock.json

@@ -0,0 +1,18 @@
+{
+  "version": 1,
+  "dependencies": {
+    "net6.0": {
+      "FSharp.Core": {
+        "type": "Transitive",
+        "resolved": "10.0.100",
+        "contentHash": "vWHaY4Pk7mUv5gJN9+rbods+QnPjhrw3sdGw2R9pFLIBzHkkN26eMgubPHZVoS7xwLA9TZuoHGLrboY5QOBcdA=="
+      },
+      "unique": {
+        "type": "Project",
+        "dependencies": {
+          "FSharp.Core": "[10.0.100, )"
+        }
+      }
+    }
+  }
+}

src/unique/packages.lock.json

@@ -0,0 +1,27 @@
+{
+  "version": 1,
+  "dependencies": {
+    ".NETStandard,Version=v2.0": {
+      "FSharp.Core": {
+        "type": "Direct",
+        "requested": "[10.0.100, )",
+        "resolved": "10.0.100",
+        "contentHash": "vWHaY4Pk7mUv5gJN9+rbods+QnPjhrw3sdGw2R9pFLIBzHkkN26eMgubPHZVoS7xwLA9TZuoHGLrboY5QOBcdA=="
+      },
+      "NETStandard.Library": {
+        "type": "Direct",
+        "requested": "[2.0.3, )",
+        "resolved": "2.0.3",
+        "contentHash": "st47PosZSHrjECdjeIzZQbzivYBJFv6P2nv4cj2ypdI204DO+vZ7l5raGMiX4eXMJ53RfOIg+/s4DHVZ54Nu2A==",
+        "dependencies": {
+          "Microsoft.NETCore.Platforms": "1.1.0"
+        }
+      },
+      "Microsoft.NETCore.Platforms": {
+        "type": "Transitive",
+        "resolved": "1.1.0",
+        "contentHash": "kz0PEW2lhqygehI/d6XsPCQzD7ff7gUJaVGPVETX611eadGsA3A877GdSlU0LRVMCTH/+P3o2iDTak+S08V2+A=="
+      }
+    }
+  }
+}

src/unique/unique.fsproj

@@ -14,6 +14,7 @@
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageTags>GUID</PackageTags>
     <Title>unique</Title>
+    <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
   </PropertyGroup>
 
   <ItemGroup>