feat(tests): add e2e test for code-server (#643)

## Description

Adds e2e test for code-server that actually installs and health checks
code-server
<!-- Briefly describe what this PR does and why -->

## Type of Change

- [ ] New module
- [ ] New template
- [ ] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [X] Other

## Testing & Validation

- [X] Tests pass (`bun test`)
- [X] Code formatted (`bun fmt`)
- [X] Changes tested locally

## Related Issues

<!-- Link related issues or write "None" if not applicable -->

registry/coder/modules/code-server/main.test.ts

@@ -1,5 +1,9 @@
 import { describe, expect, it } from "bun:test";
 import {
+  execContainer,
+  findResourceInstance,
+  removeContainer,
+  runContainer,
   runTerraformApply,
   runTerraformInit,
   testRequiredVariables,
@@ -34,5 +38,47 @@ describe("code-server", async () => {
     expect(t).toThrow("Offline mode does not allow extensions to be installed");
   });
 
-  // More tests depend on shebang refactors
+  it("installs and runs code-server", async () => {
+    const state = await runTerraformApply(import.meta.dir, {
+      agent_id: "foo",
+    });
+
+    const id = await runContainer("ubuntu:latest");
+    try {
+      await execContainer(id, [
+        "bash",
+        "-c",
+        "apt-get update && apt-get install -y curl",
+      ]);
+
+      const script = findResourceInstance(state, "coder_script").script;
+      const result = await execContainer(id, ["bash", "-c", script]);
+      if (result.exitCode !== 0) {
+        console.log(result.stdout);
+        console.log(result.stderr);
+      }
+      expect(result.exitCode).toBe(0);
+
+      const version = await execContainer(id, [
+        "/tmp/code-server/bin/code-server",
+        "--version",
+      ]);
+      expect(version.exitCode).toBe(0);
+      expect(version.stdout).toMatch(/\d+\.\d+\.\d+/);
+
+      const health = await execContainer(id, [
+        "curl",
+        "--retry",
+        "10",
+        "--retry-delay",
+        "1",
+        "--retry-all-errors",
+        "-sf",
+        "http://localhost:13337/healthz",
+      ]);
+      expect(health.exitCode).toBe(0);
+    } finally {
+      await removeContainer(id);
+    }
+  }, 60000);
 });