Gradle scaffolding doesn't properly detect app type if dependencies are declared as variables instead of strings

[mcanalesmayo]

Assume we have a project with a structure like in this Gradle example where we have a buildSrc folder which contains a Libraries class defining common dependencies that can be used in several subprojects. In the subprojects, we would declare those dependencies as follows:

dependencies {
  ...
  implementation Libraries.springboot
  ...
}

Then Habitat would not detect springboot as app type.

This is because Habitat is using a string search of "^[^/].*org.springframework.boot:spring-boot" in the build.gradle file: https://github.com/habitat-sh/core-plans/blob/master/scaffolding-gradle/lib/scaffolding.sh#L342

_detect_springboot_app() {
  if [[ -f build.gradle ]] \
      && grep -q "^[^/].*org.springframework.boot:spring-boot" build.gradle; then
    build_line "Detected Spring Boot app type"
    _app_type="springboot"
    return 0
  else
    return 1
  fi
}