Travis is terminating builds as they are producing too much logging.
A major contributor to the volume of logging is the Gradle plugin's
build. This commit switches off debug logging for the build and
enables test event logging. This considerably reduces the volume of
logging that is produced while still providing some insight into the
build's tests.

Closes gh-10436

Closes gh-7053

Add CI pipeline for builds and releases.

Fixes gh-9316

Allow longer for test responses to be returned.

See gh-9316

Upgrade the Maven plugins used in the builds.

See gh-9316

Rename `spring-boot-integration-tests-embedded-servlet-container` to
`spring-boot-server-tests`.

See gh-9316

Update integration tests so that they can use a custom local Maven
repository.

See gh-9316

Update integration test POMs to use CI friendly version numbers.

See gh-9316

Update the integration tests so that the version number is found using
the main POM.xml files. Without this change `${revision}` would be
used.

See gh-9316

Update deployment tests to allow more time for servers to start.

See gh-9316

Update the `spring-boot-deployment-tests` projects to use CI friendly
Maven files.

See gh-9316

Update the Maven build so that a local artifact repository can be
specified. This will allow the CI server to build the samples and tests
using artifacts generated from an early job.

See gh-9316

Delete `spring-boot-full-build` since it wont be necessary when we no
longer release from Bamboo.

See gh-9316

Remove the Gradle builds that were provided with some of the sample
applications since they were never directly invoked.

See gh-9316

Update `spring-boot-sample-ant` so that it works with the CI friendly
Maven POMs.

See gh-9316

Update sample POMs to follow CI friendly Maven conventions.

See gh-9316

Update launched Gradle options to include debug logging.

See gh-9316

Update `LoggingMainClassTimeWarningListener` to import individual
`Layout` inner classes. This fixes an odd javac parse issue that
otherwise occurs.

See gh-9316

Update the Gradle plugin to use version information from the
flattened POM.xml files.

See gh-9316

Fix POMs following project relocations and apply CI friendly Maven
conventions.

See gh-9316

Move integration and deployment tests under a single `spring-boot-tests`
module.

See gh-9316

Move projects to better reflect the way that Spring Boot is released.

The following projects are under `spring-boot-project`:

  - `spring-boot`
  - `spring-boot-autoconfigure`
  - `spring-boot-tools`
  - `spring-boot-starters`
  - `spring-boot-actuator`
  - `spring-boot-actuator-autoconfigure`
  - `spring-boot-test`
  - `spring-boot-test-autoconfigure`
  - `spring-boot-devtools`
  - `spring-boot-cli`
  - `spring-boot-docs`

See gh-9316

Ignore `secrets.yml` so that if can be used to hold sensitive
credentials.

See gh-9316

Ignore flattened POM files which will be generated once the build has
been reworked.

See gh-9316

Closes gh-10286

Update `LettuceConnectionConfiguration` so that `commons-pool2` can
be an optional dependency.

See gh-10480

This commit changes the default client to Lettuce. This has the side
effect of making the `spring-boot-starter-redis-reactive` irrelevant.

Recent improvements made pooling optional so `commons-pool2` is no
longer provided by default either.

Closes gh-10480

* pr/10508:
  Upgrade to HikariCP 2.7.2

Closes gh-10508

* pr/10504:
  Upgrade to JUnit Jupiter 5.0.1

Closes gh-10504

Update `spring-boot-loader` to use the same dependency versions as the
main project.

Closes gh-10446