fix(devcontainers-cli): set yarn install prefix to be one level up

devcontainers-cli/README.md

@@ -16,7 +16,7 @@ The devcontainers-cli module provides an easy way to install [`@devcontainers/cl
 ```tf
 module "devcontainers-cli" {
   source   = "registry.coder.com/modules/devcontainers-cli/coder"
-  version  = "1.0.2"
+  version  = "1.0.3"
   agent_id = coder_agent.example.id
 }
 ```

devcontainers-cli/run.sh

@@ -38,7 +38,7 @@ install() {
     fi
     pnpm add -g @devcontainers/cli
   elif [ "$PACKAGE_MANAGER" = "yarn" ]; then
-    yarn global add @devcontainers/cli --prefix "$CODER_SCRIPT_BIN_DIR"
+    yarn global add @devcontainers/cli --prefix "$(dirname "$CODER_SCRIPT_BIN_DIR")"
   fi
 }