Switch to Adoptium JDK for runtime

[mattwelke]

Right now, it's using jlink to produce a runtime. Normally, one would use jlink to produce a runtime as small as possible, including only the modules needed by their app's code. However, OpenWhisk users may have any use case, so that's why the current Dockerfile attempts to include every module.

For simplicity, we may as well just use a JDK instead of a custom runtime. Even modules including things like compiler tools may be useful for niche use cases that OpenWhisk users may have.

Additionally, the Dockerfile still contains copy-pasted code from when I experimented with jlink using Microsoft tutorials. We should switch from a Microsoft build to an Adoptium build (https://adoptium.net/) because it will be more likely to be recognized and understood by OpenWhisk users.