Suggestion: set requirement target for a target (build before)

[back-2-95]

Just basically saying that please build some target before building this target.

Target is using build image from another target in FROM statement.

Example (I used the word require here):

target "base-7.3" {
  inherits = ["common", "base"]
  args = {
    PHP_VERSION = "7.3"
    PHP_SHORT_VERSION = "73"
  }
  tags = ["${REPO_BASE}:7.3", "${REPO_BASE}:${PHP73_MINOR}"]
}

target "web-7.3" {
  require = ["base-7.3"]
  inherits = ["common", "base-7.3", "web"]
  tags = ["${REPO_WEB}:7.3", "${REPO_WEB}:${PHP73_MINOR}"]
}

[tonistiigi]

duplicate of #447