https://github.com/testcontainers/testcontainers-java-examples

gradle-based:
https://github.com/bsideup/javaagent-boilerplate
https://github.com/bsideup/javaagent-boilerplate/blob/master/src/test/java/support/GroovyTestApp.java
https://github.com/bsideup/javaagent-boilerplate/blob/master/src/test/java/support/BasicTestApp.java
https://github.com/bsideup/javaagent-boilerplate/blob/master/src/test/java/AgentTest.java
https://github.com/lumberjackdev/spring-boot-java-11-postgres-template

https://hub.docker.com/r/zeroturnaround/groovy/~/dockerfile/
FROM java:8

simple-alpine-file-copy:
https://github.com/testcontainers/testcontainers-java/blob/master/core/src/test/java/org/testcontainers/utility/DirectoryTarResourceTest.java

2021
https://candrews.integralblue.com/2021/08/cypress-testing-integrated-with-gradle-and-spring-boot/
https://mister11.github.io/posts/testing_spring_webflux_application/
https://github.com/jobrunr/jobrunr/blob/master/tests/e2e-vm-jdk/src/test/java/org/jobrunr/tests/fromhost/MavenBuildAndTestContainer.java
    .withFileSystemBind(Paths.get(System.getProperty("user.home"), ".m2").toString(), "/root/.m2");
    .withCopyFileToContainer(MountableFile.forHostPath(Paths.get(".")), "/app/jobrunr")
    .waitingFor(Wait.forLogMessage(".*BUILD SUCCESS.*|.*BUILD FAILED.*|.*FAILURE: Build failed.*", 1));
https://github.com/jobrunr/jobrunr/blob/master/tests/e2e-vm-jdk/src/test/java/org/jobrunr/tests/fromhost/JdkTest.java

https://github.com/DarrenForsythe/testing-databases
https://github.com/nielsutrecht/spring-datastore-examples