[copilot] setup .github/workflows/copilot-setup-steps.yml (#1175)

Fixes: #1174

Context: https://docs.github.com/en/copilot/customizing-copilot/customizing-the-development-environment-for-copilot-coding-agent

Setup `.github/workflows/copilot-setup-steps.yml`, which is a Github action
that runs (only on Ubuntu) prior to Copilot doing its work.

This makes Copilot more useful, as it has a locally cloned and built source tree
with all dependencies installed. Copilot will be able to run various commands
to achieve tasks as assigned.

Author: Copilot

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

@@ -0,0 +1,41 @@
+name: "Copilot Setup Steps"
+
+on: workflow_dispatch
+
+jobs:
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: '8.x'
+
+    - name: Install Cake .NET Tool
+      run: dotnet tool install -g cake.tool
+
+    - name: Install Android workload
+      run: dotnet workload install android
+
+    - name: Setup OpenJDK 11
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'microsoft'
+        java-version: '11'
+
+    - name: Run dotnet cake
+      run: dotnet cake
+
+    - name: Display environment info
+      run: |
+        echo "=== Environment Summary ==="
+        echo ".NET Version: $(dotnet --version)"
+        echo "Java Version: $(java -version 2>&1 | head -1)"
+        echo "Android SDK Root: $ANDROID_SDK_ROOT"
+        echo "Java Home: $JAVA_HOME"
+        echo "=== Installed Workloads ==="
+        dotnet workload list