Update 01-install-extensions.sh

.coder/01-install-extensions.sh

-code-server --install-extension ckolkman.vscode-postgres
\ No newline at end of file
+# Wait for code server to be ready
+until [ -f /home/ost/.local/bin/code-server ]
+do
+  sleep 1
+done
+
+code-server --install-extension ckolkman.vscode-postgres