feat: adding curl to distrolles image

[ericchaves]

Hi folks,

In this PR I've changed the gradle configuration in order to build a local image adding curl to the image, allowing declaring services that depends on the mock-aoauth2-server to be up and healthy, like the example at the end.

However in order to be merged, this PR may require some extra work that I don't know how to do:

the original build.gradle.kts builds multiarch container images. I'm not sure to achieve this given that the current workflow uses the github/workflows to publish into a GCR repository. The way I'm used to build multiarch images ,the docker build command needs to push images to a registry as part of the build and I never did something like this so I wouldn't be able to test it properly.

Anyway, hope this helps somehow. =)

sample compose.yaml

services:
  mock-oauth2-server:
    image: mock-oauth2-server:latest
    healthcheck:
      test: ["CMD", "curl", "--retry", "7", "--retry-delay", "1", "--retry-connrefused", "-f", "http://localhost:8080/isalive"]
      interval: 10s
      timeout: 5s
      retries: 3
      start_period: 5s
    ports:
      - "8080:8080"
    volumes:
      - ./src/test/resources/config.json:/app/config.json
      - ./src/test/resources/login.example.html:/app/login/login.example.html
      - ./src/test/resources/static/:/app/static/
    environment:
      LOG_LEVEL: "debug"
      SERVER_PORT: 8080
      JSON_CONFIG_PATH: /app/config.json

  test-healthcheck:
    image: curlimages/curl:latest
    depends_on:
      mock-oauth2-server:
        condition: service_healthy
    command: http://mock-oauth2-server:8080/issuer1/.well-known/openid-configuration