check out the G2 repo for copilot

Author: yihui

.Rbuildignore

@@ -7,3 +7,4 @@
 ^package\.json$
 ^package-lock\.json$
 ^examples$
+^G2$

.github/copilot-instructions.md

@@ -97,7 +97,10 @@ in headless browsers (Playwright or Puppeteer) and attach them to the PR.
 
 ### G2 Reference
 
-When in doubt about G2 features, marks, or coordinate systems, always refer to:
+When dealing with issues that you cannot solve easily, you should dig into G2's
+source code and documentation, which have been checked out to the directory `G2`
+under the root directory for you. Use that as the source of truth.
+
 - **G2 source repository**: https://github.com/antvis/G2
 - **G2 documentation site**: https://g2.antv.antgroup.com
 

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

@@ -20,6 +20,12 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@HEAD
 
+      - name: Checkout G2
+        uses: actions/checkout@HEAD
+        with:
+          repository: antvis/G2
+          path: G2
+
       - name: Install R
         uses: r-lib/actions/setup-r@HEAD
         with: