Use Maven wrapper for Jib example easier start.

[ivanporty]

When working on coming IntelliJ IDE plugin demos, running Jib example is not as easy as it could be with a added Maven wrapper. Maven is required in PATH for example to work, but it may not be used at all (i.e. developer uses Gradle instead) or not used in CLI (internal IDE support for Maven). Maven wrapper will download and provide Maven automatically and Jib knows how to pick it up.

Also, this PR exposes container port for port forwarding in the container section, without it skaffold does not port-forward 8080 automatically.

[codecov-io]

Codecov Report

Merging #1471 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1471   +/-   ##
=======================================
  Coverage   44.43%   44.43%           
=======================================
  Files         112      112           
  Lines        4641     4641           
=======================================
  Hits         2062     2062           
  Misses       2372     2372           
  Partials      207      207

---

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[codecov-io]

Codecov Report

Merging #1471 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1471   +/-   ##
=======================================
  Coverage   44.43%   44.43%           
=======================================
  Files         112      112           
  Lines        4641     4641           
=======================================
  Hits         2062     2062           
  Misses       2372     2372           
  Partials      207      207

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2f99903...5e280ca. Read the comment docs.

[coollog]

Should we use version 3.6.0 since that is the latest?

[ivanporty]

Sure, good idea, I'll bump up the version.

[dgageot]

@ivanporty this is awesome. One issue, you have to also fix the same sample under integration/examples. I know this is painful...

[ivanporty]

Ah, good to know, let me make the changes there as well.

[ivanporty]

@dgageot the integration example is updated as well, let me know if something else is missing, thanks!