feat(smoketest): add Opensearch as a sample app

[tthvo]

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Related to #403

Description of the change:

• Added OpenSearch as a sample application. OpenSearch is configured to run as a single node with JFR and JMX enabled.
• Also added an Opensearch Dashboard to work with Opensearch if needed.
• Some cleanups:
  • Ignore generated certs and keys.
  • Update scripts to create directory when necessary.
  • Ignored failed rm operations. For example, when the certs are not present.

Motivation for the change:

See #403. OpenSearch is a pretty popular search engine, written Java. I think it's good to have Cryostat tested against it. I guess we can later add a minimal ElasticSearch + Kibana.

How to manually test:

bash smoketest -t

To access opensearch dashboard, visit: http://localhost:5601 with credentials: admin/password4Opense@rch

Others

I am thinking the smoketest script can categorize the types of sample apps. For example, basic, basic-with-agent, search, etc. Then, we can run bash smoketest -t basic,search.

[andrewazores]

I am thinking the smoketest script can categorize the types of sample apps. For example, basic, basic-with-agent, search, etc. Then, we can run bash smoketest -t basic,search.

This is a good idea, since running all of the sample apps ends up taking more and more resources on the workstation (and more time to pull and start containers) and may not always be desired. But -t alone, or -t all, should still be available so we can run everything at once to provide a full test suite without having to restart the smoketest to test against different things.