Closes gh-23384

Closes gh-23185

Closes gh-23189

Closes gh-23010

Closes gh-23382

Closes gh-23199

Closes gh-23198

* gh-22972:
  Polish "Support authentication to private Docker registry"
  Support authentication to private docker registry

Closes gh-22972

See gh-22972

This commit adds the ability to configure Docker image registry
authentication credentials in the Maven and Gradle plugins. The
authentication credentials are passed to the Docker daemon with
all daemon API calls, and the daemon forwards the credentials to the
image registry when necessary. This makes it possible to use
builder and run images stored in a private Docker registry.

See gh-22972

Closes gh-23378

The version of Spring Boot should not be modifiable by a property,
only being using a different version of spring-boot-dependencies or
spring-boot-starter-parent.

Fixes gh-23174

Closes gh-23374

Closes gh-23377

Closes gh-23376

Closes gh-23375

Closes gh-23374

Closes gh-23011

Closes gh-23373

Closes gh-23372

Closes gh-23371

Closes gh-23197

Closes gh-23196

Closes gh-23195

Closes gh-23194

* pr/22366:
  Document that Java 15 is a supported version

Closes gh-22366