MAINT set up GitHub Copilot in devcontainer

.devcontainer/Dockerfile

@@ -65,6 +65,9 @@ RUN echo "vscode ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
 RUN curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
  && apt-get install -y nodejs \
  && npm install -g npm@latest \
+ && npm install -g @github/copilot@0.0.421 \
+ && npm cache clean --force \
+ && rm -rf /root/.npm \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/*
 

.devcontainer/devcontainer.json

@@ -84,7 +84,9 @@
         "dbaeumer.vscode-eslint",
         "esbenp.prettier-vscode",
         "ms-playwright.playwright",
-        "orta.vscode-jest"
+        "orta.vscode-jest",
+        "github.copilot",
+        "github.copilot-chat"
       ]
     }
   },