added stocks app codebase and md

worker-toolkit-stocks-in-the-future/scripts/lib/check-devcontainer.ts

@@ -0,0 +1,19 @@
+import { existsSync } from 'node:fs';
+
+(function checkDevcontainer() {
+  if (process.env._RACCOON_TOOLKIT_DEVCONTAINER_CHECK_DONE === '1') return;
+  process.env._RACCOON_TOOLKIT_DEVCONTAINER_CHECK_DONE = '1';
+
+  const inContainer = process.env.IN_DEVCONTAINER === '1' || existsSync('/.dockerenv');
+  if (inContainer) return;
+  if (process.env.SUPPRESS_DEVCONTAINER_WARNING === '1') return;
+  if (process.env.CI === 'true' || process.env.CI === '1') return;
+
+  const yellow = '\x1b[33m';
+  const reset = '\x1b[0m';
+  process.stderr.write(
+    `${yellow}Warning: this script is meant to run inside the toolkit devcontainer.${reset}\n` +
+      `  Reopen this toolkit folder in its devcontainer and run the command again.\n` +
+      `  (suppress with SUPPRESS_DEVCONTAINER_WARNING=1)\n`
+  );
+})();