OpenSearch Dashboards image

[siegfriedweber]

Tasks

• feat: Add image for OpenSearch Dashboards docker-images#1248
• test: Create integration test for OpenSearch Dashboards #39
• docs: Add documentation on using the OpenSearch Dashboards image #41
• Add the image to SecObserve: https://secobserve.stackable.tech/#/products/46/show

Part of #1