Implement yaml extensions overwriting the default pod/container spec (#75)

* 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

packages/k8s/package.json

@@ -17,7 +17,8 @@
     "@actions/exec": "^1.1.1",
     "@actions/io": "^1.1.2",
     "@kubernetes/client-node": "^0.18.1",
-    "hooklib": "file:../hooklib"
+    "hooklib": "file:../hooklib",
+    "js-yaml": "^4.1.0"
   },
   "devDependencies": {
     "@types/jest": "^27.4.1",