* Implement yaml extensions overwriting the default pod/container spec
* format files
* Extend specs for container job and include docker and k8s tests in k8s
* Create table tests for docker tests
* included warnings and extracted append logic as generic
* updated merge to allow for file read
* reverted back examples and k8s/tests
* reverted back docker tests
* Tests for extension prepare-job
* Fix lint and format and merge error
* Added basic test for container step
* revert hooklib since new definition for container options is received from a file
* revert docker options since create options are a string
* Fix revert
* Update package locks and deps
* included example of extension.yaml. Added side-car container that was missing
* Ignore spec modification for the service containers, change selector to
* fix lint error
* Add missing image override
* Add comment explaining merge object meta with job and pod
* fix test
