Upgrade to using Jakarta EE 10 from Java EE 8 by mostly following the upgrade instructions. Only the servlet package is upgrade. Other Jakarta EE components (like the persistence package that Hibernate depends on) need to be upgraded separately.
TESTED=deployed and successfully communicated with the pubapi endpoint for web WHOIS.
Note that this currently requires packaing the App Engine runtime per instructions here due to GoogleCloudPlatform/appengine-java-standard#98. This PR will only be merged until the fix is deployed to production (https://rapid.corp.google.com/#/release/serverless_runtimes_run_java/java21_20240310_21_0).
Chose the default transaction manager based on RegistryEnvironment. This
makes it possible to run nomulus on Jetty locally. Tested with the
following:
```bash
./gradle :jetty:run -Penvironment=alpha
curl http://localhost:8080/beta.app
```
The docker image is also updated to take an argument that specifies the
environment. It runs locally as well but the container doesn't get
access to locally stored credentials, so it fails to initialize the
transaction manager.
This PR creates a unified RegistryServlet that will serve all
non-console traffic. It also creates a jetty subproject that allows one
to run Nomulus on top of a standard Jetty 12 runtime.
`./gradlew :jetty:stage` will create a jetty base folder at
`jetty/build/jetty-base` where one is able spin up a local Nomulus server
by running the following command inside the folder:
```bash
java -jar ${JETTY_HOME}/start.jar
```
`JETTY_HOME` is a folder where the [Jetty runtime](https://repo1.maven.org/maven2/org/eclipse/jetty/jetty-home/12.0.6/jetty-home-12.0.6.zip) is located.
This PR also adds a Gradle task to create a Nomulus image based on the
official Jetty image:
```bash
./gradlew :jetty:buildNomulusImage
```
