feat: add MCP configuration for GitHub Copilot and update workflow environment variables

Author: raykao

.github/mcp.json

@@ -0,0 +1,11 @@
+{
+  "mcpServers": {
+    "github": {
+      "type": "http",
+      "url": "https://api.githubcopilot.com/mcp/",
+      "headers": {
+        "Authorization": "Bearer ${GITHUB_MCP_TOKEN}"
+      }
+    }
+  }
+}

.github/workflows/copilot.generate-docs.yml

@@ -20,14 +20,17 @@ jobs:
           fetch-depth: 0
 
       - name: Install GitHub Copilot CLI
+        env:
+          GH_TOKEN: ${{ secrets.COPILOT_CLI_TOKEN }}
         run: |
           curl -fsSL https://gh.io/copilot-install | bash
           echo "Installed Copilot CLI version:"
           copilot --version
                     
       - name: Analyze and delegate to Copilot
         env:
-          GITHUB_TOKEN: ${{ secrets.COPILOT_CLI_TOKEN }}
+          GH_TOKEN: ${{ secrets.COPILOT_CLI_TOKEN }}           # Personal PAT for Copilot API authentication
+          GITHUB_MCP_TOKEN: ${{ secrets.GITHUB_TOKEN }}        # Workflow token for MCP GitHub operations (issues)
         run: |
           echo "Analyzing commit ${{ github.sha }}"
           echo "Loading documentation criteria from prompt..."
@@ -42,4 +45,6 @@ jobs:
           echo "- Copilot will create an issue and assign it to itself if needed"
           echo ""
 
-          copilot -p "$PROMPT" --enable-all-github-mcp-tools --allow-all-tools
+          copilot -p "$PROMPT" \
+            --mcp-config .github/mcp.json \
+            --allow-all-tools