Beginner help: db/postgres properties and basic gradlew

[seanoc5]

Hi, my experience with gradle is fairly basic. I'm not familiar with the nuances of having multiple subprojects in on repo.
I'm starting with the semantic-search example, and stumbled upon this gradle command to start that "subproject" from the repo 'root' folder:
./gradlew :use-cases:semantic-search:bootTestRun
which seems to correctly use a testContainer for postgres (with pgvector enabled). I do also have a non-containerized postgres service running by default, but stopped it while working on understanding the demo apps (and using testContainers)

The command in the readme :
./gradlew bootTestRun
fails in the semantic-search folder because there is no ./gradlew.
Perhaps I am lacking some basic/implied understanding of gradle/gradlew?
This is more of checking my sanity/understanding rather than an actual problem or issue. Is this 'best practice' or is there a better approach I should take?

Second: I notice the application.yml for each subproject does not have datasource settings. This again is likely me having missed something basic/implied in the configuration. Should I be adding something like the following to each of the sub application.yml files?

spring:
  datasource:
    url: jdbc:postgresql://localhost:5432/thomasvitale
    username: myuser
    password: mypass
    driver-class-name: org.postgresql.Driver
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

In any event, thanks for publishing this repo with great examples. These are a huge help!