Apply suggestions from code review

Co-authored-by: Mathias Fredriksson <mafredri@gmail.com>

test.ts

@@ -44,7 +44,7 @@ export const executeScriptInContainer = async (
   const instance = findResourceInstance(state, "coder_script");
   const id = await runContainer(image);
   // const resp = await execContainer(id, [shell, "-c", instance.script]);
-  command = command + " " + instance.script;
+  command = command + "; " + instance.script;
   const resp = await execContainer(id, [shell, "-c", command]);
   const stdout = resp.stdout.trim().split("\n");
   const stderr = resp.stderr.trim().split("\n");