Install dotnet SDK acrh x64 for MacOS

Author: abhinavminhas

.github/workflows/build.yml

@@ -26,7 +26,15 @@ jobs:
       with:
         fetch-depth: 0
 
+    - name: Install .NET Core SDK [ Version - ${{ matrix.dotnet-version }} ] (MacOS)
+      if: ${{ runner.os == 'macOS' }}
+      uses: ./.github/workflows/install-dotnet-core
+      with:
+          dotnet-version: ${{ matrix.dotnet-version }}
+          architecture: x64
+
     - name: Dotnet Version (${{ matrix.dotnet-version }})
+      if: ${{ runner.os != 'macOS' }}
       uses: actions/setup-dotnet@v4
       with:
         dotnet-version: ${{ matrix.dotnet-version }}

.github/workflows/install-dotnet-core/action.yml

@@ -0,0 +1,72 @@
+name: Install .NET Core SDK
+description: Installs a specified .NET Core SDK version
+
+inputs:
+  dotnet-version:
+    description: The version of .NET SDK to install (e.g., 3.1.426)
+    required: true
+  architecture:
+    description: Target architecture (e.g., x64 or arm64)
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - name: Resolve .NET Core SDK Version
+      shell: bash
+      env:
+        RAW_INPUT: ${{ inputs.dotnet-version }}
+      run: |
+        DOTNET_CHANNEL="${RAW_INPUT%%.x}"
+
+        RELEASE_INDEX_URL="https://builds.dotnet.microsoft.com/dotnet/release-metadata/releases-index.json"
+
+        # Get the URL to the channel-specific releases.json
+        RELEASES_JSON_URL=$(curl -s $RELEASE_INDEX_URL \
+          | jq -r --arg ver "$DOTNET_CHANNEL" '
+              .["releases-index"][]
+              | select(.["channel-version"] == $ver)
+              | ."releases.json"')
+
+        if [ -z "$RELEASES_JSON_URL" ]; then
+        echo "Could not resolve releases.json URL for channel $DOTNET_CHANNEL"
+        exit 1
+        fi
+        
+        # Download and extract latest SDK version
+        DOTNET_VERSION=$(curl -s $RELEASES_JSON_URL \
+          | jq -r '
+              .releases[]
+              | select(.sdk.version != null)
+              | .sdk.version' \
+          | sort -Vr \
+          | head -n1)
+
+        if [ -z "$DOTNET_VERSION" ]; then
+        echo "Could not resolve SDK version from $RELEASES_JSON_URL"
+        exit 1
+        fi
+        
+        echo "Resolved full SDK version: $DOTNET_VERSION"
+        echo "DOTNET_VERSION=$DOTNET_VERSION" >> $GITHUB_ENV
+
+    - name: Install .NET Core SDK [ ${{ inputs.dotnet-version }} ]
+      shell: bash
+      run: |
+        ARCHITECTURE="${{ inputs.architecture }}"
+        INSTALL_DIR=$HOME/dotnet
+
+        echo "Installing .NET SDK $DOTNET_VERSION for $ARCHITECTURE..."
+        mkdir -p "$INSTALL_DIR"
+        curl -sSL https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh -o dotnet-install.sh
+        chmod +x dotnet-install.sh
+        ./dotnet-install.sh --version "$DOTNET_VERSION" --install-dir "$INSTALL_DIR" --architecture "$ARCHITECTURE"
+
+    - name: Add dotnet to PATH
+      shell: bash
+      run: echo "$HOME/dotnet" >> $GITHUB_PATH
+
+    - name: Check .NET SDK
+      shell: bash
+      run: |
+        dotnet --info