Fix debugpy path mapping and DOCKER_FLAGS var name

- Fix remoteRoot in launch.json: LocalStack places lambda code at
  /tmp/aws-toolkit-vscode/lambda/us-east-1/order-handler, not /var/task
- Rename LOCALSTACK_DOCKER_FLAGS -> DOCKER_FLAGS in devcontainer remoteEnv
- Add Terraform to README prerequisites

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: whummer

.devcontainer/devcontainer.json

@@ -25,7 +25,7 @@
     "LOCALSTACK_APPINSPECTOR_DEV_ENABLE": "1",
     "LOCALSTACK_LAMBDA_DEBUG_MODE": "1",
     "LOCALSTACK_LAMBDA_DEBUG_MODE_CONFIG_PATH": "/tmp/ls-debug/lambda_debug_mode.yaml",
-    "LOCALSTACK_DOCKER_FLAGS": "-v /workspaces/localstack-workshop/.localstack:/tmp/ls-debug"
+    "DOCKER_FLAGS": "-v /workspaces/localstack-workshop/.localstack:/tmp/ls-debug"
   },
   "postStartCommand": "bash ./00-setup/setup.sh"
 }

.vscode/launch.json

@@ -12,7 +12,7 @@
       "pathMappings": [
         {
           "localRoot": "${workspaceFolder}/01-serverless-app/lambdas/order_handler",
-          "remoteRoot": "/var/task"
+          "remoteRoot": "/tmp/aws-toolkit-vscode/lambda/us-east-1/order-handler"
         }
       ]
     }

README.md

@@ -4,7 +4,7 @@ Hands-on workshop: local serverless development with [LocalStack](https://locals
 
 **Duration:** ~3 hours  
 **Level:** Intermediate  
-**Prerequisites:** Docker, Python 3.10+, VS Code (for module 03)
+**Prerequisites:** Docker, Python 3.10+, Terraform, VS Code (for module 03)
 
 ---