Utilise quay.io for test images

Caused by: org.testcontainers.containers.ContainerFetchException: Failed to pull image: jboss/keycloak:10.0.1
    at org.testcontainers.images.RemoteDockerImage.resolve(RemoteDockerImage.java:96)
    at org.testcontainers.images.RemoteDockerImage.resolve(RemoteDockerImage.java:26)
    at org.testcontainers.utility.LazyFuture.getResolvedValue(LazyFuture.java:17)
    at org.testcontainers.utility.LazyFuture.get(LazyFuture.java:39)
    at org.testcontainers.containers.GenericContainer.getDockerImageName(GenericContainer.java:1282)
    ... 29 more
Caused by: com.github.dockerjava.api.exception.InternalServerErrorException: Status 500: {"message":"toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit"}

    at org.testcontainers.shaded.com.github.dockerjava.core.DefaultInvocationBuilder.execute(DefaultInvocationBuilder.java:247)
    at org.testcontainers.shaded.com.github.dockerjava.core.DefaultInvocationBuilder.lambda$executeAndStream$1(DefaultInvocationBuilder.java:269)
    at java.base/java.lang.Thread.run(Thread.java:834)