Makefile: Add capability to validate individual runtime images

[ptitzler]

This PR adds a new validate-runtime-image task to the Makefile, which can be used to verify that a given container image meets the minimum requirements for runtime images.

Invocation:

 $ make validate-runtime-image image=<image:tag>

Examples:

• Invalid invocation

  $ make validate-runtime-image
  Usage: make validate-runtime-image image=<container-image-name>
  make: *** [validate-runtime-image] Error 1
  

• Invalid container image name

  $ make validate-runtime-image image=no-such-image:tag. 
  ***********************************************************
  Validating container image no-such-image:tag
  -----------------------------------------------------------
  => Loading container image ...
  Container image no-such-image:tag is not present, pulling...
  Error response from daemon: pull access denied for no-such-image, repository does not exist or may 
  require 'docker login': denied: requested access to the resource is denied
  ERROR: pull of container image no-such-image:tag failed
  make: *** [validate-runtime-image] Error 1
  

• Container image fails validation

  $ make validate-runtime-image image=busybox:stable   
  ***********************************************************
  Validating container image busybox:stable
  -----------------------------------------------------------
  => Loading container image ...
  => Checking container image busybox:stable for curl...
  ERROR: Container image busybox:stable does not meet criteria for command: curl
  => Checking container image busybox:stable for python3...
  ERROR: Container image busybox:stable does not meet criteria for command: python3
  -----------------------------------------------------------
  => ERROR: Container image busybox:stable is not a suitable Elyra runtime image
  make: *** [validate-runtime-image] Error 1
  

• Container image passes validation

  $ make validate-runtime-image image=amancevice/pandas:1.4.1
  ***********************************************************
  Validating container image amancevice/pandas:1.4.1
  -----------------------------------------------------------
  => Loading container image ...
  => Checking container image amancevice/pandas:1.4.1 for curl...
  => Checking container image amancevice/pandas:1.4.1 for python3...
  => Checking notebook execution...
  Collecting ipykernel==6.13.0
  Downloading ipykernel-6.13.0-py3-none-any.whl (131 kB)
  ...
  -----------------------------------------------------------
  => Container image amancevice/pandas:1.4.1 is a suitable Elyra runtime image
  

Notes:

• The task is not listed when make (without parameters) is run. Perhaps it should since it's a task Elyra users should perform.

Closes #2774

What changes were proposed in this pull request?

• See above.
• The existing validate-runtime-images task invokes the new validate-runtime-image task, passing the container image name as an argument.
• The output was cleaned up and processing optimized.
• Updated relevant documentation (Add image verification steps to 'Creating a custom runtime container image' documentation #2882)

How was this pull request tested?

• Ran the following:
  • make validate-runtime-images
  • make validate-runtime-image image=no-such-image:tag
  • make validate-runtime-image image=image-that-fails:validation
  • make validate-runtime-image image=image-that-passes:validation

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[akchinSTC]

works as advertised