Cleanup, modify Dockerfile.

Dockerfile

@@ -1,6 +1,6 @@
 FROM tiangolo/uvicorn-gunicorn-fastapi:python3.10-slim
 
-# New comment to trigger an image rebuild
+# Comment to trigger an image rebuild
 
 # Optional build argument for different environments
 ARG ENV

terraform/data.tf

@@ -192,8 +192,10 @@ data "template_file" "step_function_policy" {
   }
 }
 
-# Hash of the contents of the FastAPI app docker
+# Hash of the contents of the FastAPI app docker. The docker commands run in main
+# directory (parent directory of terraform directory), and the Docker file is in the
+# same directory.
 data "external" "hash" {
-  program = [coalesce(var.hash_script, "${path.module}/scripts/hash.sh"), "${path.root}/../", var.docker_path]
+  program = ["${path.root}/scripts/hash.sh", "${path.root}/../", "."]
 }
 

terraform/variables.tf

@@ -156,21 +156,3 @@ variable "api_gateway_url" {
   description = "The invoke url of the API Gateway stage"
   default     = ""
 }
-
-variable "root_dir" {
-  description = "Root dir used in Dockerfile"
-  type        = string
-  default     = "."
-}
-
-variable "docker_path" {
-  description = "Path to Docker image source, relative to root dir"
-  type        = string
-  default     = "."
-}
-
-variable "hash_script" {
-  description = "Path to script to generate hash of source contents"
-  type        = string
-  default     = ""
-}