Try docker bake and see if it can make grasping build hierarchy easy

[Toraja]

• Currenty it is hard to figure out which image is build upon which image
• Also it is very tedious to build images one by one from bottom to top
  • e.g. base -> lcde/base -> rust -> lcde/rust
• Check if docker bake can help with that

[Toraja]

Summary

• It does make it slightly easier to grasp the hierarchy, by placing everything in a single file

  variable "EXT_BASE_IMAGE" {
  default = "base"
  }
  
  variable "IMAGE_TAG_PREVIX" {
  default = "cde/"
  }
  
  target "base" {
  context = "base"
  tags = ["${IMAGE_TAG_PREVIX}base"]
  }
  
  target "go" {
  context = "go"
  contexts = {
    baseimage = "target:${GO_BASE_IMAGE}"
  }
  tags = ["${IMAGE_TAG_PREVIX}go"]
  }

• To include localised version, you need to specify another file using flag

  docker buildx bake --file env/docker-bake.hcl --file env/localise/docker-bake.hcl

• If the context path is relative path, it must be relative to the current directory.

  variable "LOCALISE_IMAGE_TAG_PREVIX" {
  default = "${IMAGE_TAG_PREVIX}/localise"
  }
  
  # Use LOCALISE_IMAGE_TAG_PREVIX to avoid image name collision
  # Or, you can intentionally collide if you don't need non-localised version
  target "localise-go" {
  context = "localise/go"
  contexts = {
    baseimage = "target:${LOCALISE_GO_BASE_IMAGE}"
  }
  tags = ["${LOCALISE_IMAGE_TAG_PREVIX}ext"]
  }
  
  # You can use IMAGE_TAG_PREVIX if you are sure that image name will not collide
  target "project-x" {
  context = "project-x"
  contexts = {
    baseimage = "target:${PROJECT_X_BASE_IMAGE}"
  }
  tags = ["${IMAGE_TAG_PREVIX}ext"]
  }

Things to consider

• Bake file for localised cde needs to be included only if it exists
• bake command does not read .env
  • Current way does not depend on docker compose reading .env file automatically, and instead loads it using Makefile's functionality, so this won't be a problem.
• To build single target, pass t=xxx to make command

[Toraja]

TODO

• [X] Write bake file
• [X] Modify FROM instruction in each DOCKERFILE except for base
• [X] Rename variables as UID is readonly and cannot be overwritten
  • Source .env after exporting other variables so that those can be overwritten
• [X] Try baking
  • [X] base
  • [X] others
• [ ] Enable incorporating localisation

[Toraja]

Need to work on #24 first so localisation will be done later (#25)