Update Dockerfile

Dockerfile

@@ -129,6 +129,11 @@ RUN useradd -ms /bin/bash vscode \
 USER vscode
 ENV PATH=$PATH:/home/vscode/.local/bin
 
+# Set this env before launching code-server
+ENV EXTENSIONS_GALLERY=https://marketplace.visualstudio.com/_apis/public/gallery
+ENV VSCODE_AGENT="vscode"
+ENV VSCODE_GALLERY_PRODUCT="code-server"
+
 # -----------------------------
 # Entrypoint: restore + code-server
 # -----------------------------