test(test-tooling): add container image builder utilities

[petermetz]

1. Currently our integration tests depend on pre-published container
   images to be on the official registry (ghcr.io). This has pros and cons.
   The pro is that we can pin the tests to a specific ledger version and
   then have confidence that the test code works with that specific image.
   On the other hand if the image itself has problems we won't know it until
   after it was published and then tests were executed with it (unless we
   perform manual testing which is a lot of effrot as it requires the
   manual modification of the test cases).
2. In order to gives us the ability to test against the container image
   definitions as they are in the current revision of the source code,
   we are adding here a couple of utility functions to streamline writing
   test cases that build the container images for themselves as part of the
   test case.

An example of how to use it in a test case:

const imgConnectorJvm = await buildImageConnectorCordaServer({
    logLevel,
});

// ...

connector = new CordaConnectorContainer({
    logLevel,
    imageName: imgConnectorJvm.imageName,
    imageVersion: imgConnectorJvm.imageVersion,
    envVars: [envVarSpringAppJson],
});

Signed-off-by: Peter Somogyvari [email protected]

Pull Request Requirements

• Rebased onto upstream/main branch and squashed into single commit to help maintainers review it more efficient and to avoid spaghetti git commit graphs that obfuscate which commit did exactly what change, when and, why.
• Have git sign off at the end of commit message to avoid being marked red. You can add -s flag when using git commit command. You may refer to this link for more information.
• Follow the Commit Linting specification. You may refer to this link for more information.

Character Limit

• Pull Request Title and Commit Subject must not exceed 72 characters (including spaces and special characters).
• Commit Message per line must not exceed 80 characters (including spaces and special characters).

A Must Read for Beginners
For rebasing and squashing, here's a must read guide for beginners.

[jagpreetsinghsasan]

LGTM.
This was a much needed feature! I will inform the team about the same

[outSH]

This is great, LGTM, thank you!

[petermetz]

This is great, LGTM, thank you!

@outSH Thank you! For now I only have the ready-made utility functions for the corda images, but we can add more, ideally all images would be possible to be built by the tests like this in the future.