Fix multi-module release_package

[see-quick]

This PR fixes how we use release_package. Currently, makefile assumed single JAR at root but in this case as we are using multi-module we have jar in each of this directories instead of root target dir.

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[see-quick]

Please take a look @strimzi/maintainers .

[scholzj]

Would it be better to have some dedicated Maven module to assemble the connectors and pack them into a single archive?

[see-quick]

Would it be better to have some dedicated Maven module to assemble the connectors and pack them into a single archive?

Currently this 6 LOC is doing exactly that. It copies each jars into release directory (i.e., target/release/) and then pack them into single archive which looks like this:

 strimzi-test-connectors-0.1.0-SNAPSHOT.tar.gz/zip
   \── fault-injection-source-connector-0.1.0-SNAPSHOT.jar
   \── another-one-connnector-0.1.0-SNAPSHOT.jar
   \── another-one-connector-2-0.1.0-SNAPSHOT.jar

I am not 100% sure I see the benefit of having a separate Maven module here, but I am open to change it if we think it would be good.

Update (for better handling in the test-container-images) it would have this format:

 strimzi-test-connectors-0.1.0-SNAPSHOT.tar.gz // (or .zip)
  ├── fault-injection-source-connector/
  │   └── fault-injection-source-connector-0.1.0-SNAPSHOT.jar
  ├── another-one-connnector/
  │    └── another-one-connnector-0.1.0-SNAPSHOT.jar
  └── another-one-connnector-2/
       └── another-one-connector-2-0.1.0-SNAPSHOT.jar

so then I can easily put it inside connector_plugins/

[Frawless]

I think it might be more readable to have separated module that will pack the jars into one zip. Overall the output will be the same, but it could be harder to read the makefile. Also there might be some benefit to have it as output from mvn directly?

[see-quick]

I think it might be more readable to have separated module that will pack the jars into one zip. Overall the output will be the same, but it could be harder to read the makefile. Also there might be some benefit to have it as output from mvn directly?

Okay, I will create separate Maven module then, thanks.

[see-quick]

Created separated module for distributions using assembly-plugin let me know what you think. Thanks.

[scholzj]

LGTM. Thanks.