Implement imgtool sanity test in CI

[davidvincze]

It has happened before that basic functionalities, commands of imgtool have been broken (e.g. #1746) and it went unnoticed for a while. This issue wants to focus on and track the effort to get a new test implemented as part of the existing imgtool GitHub workflow.

This new sanity test can even be implemented as a Python unit test using one of the existing unit test frameworks or a simple basic bash script that invokes all the available commands of imgtool with different parameters and then compare the output with a known data set (e.g. signed template image, public key... ) to detect regression.

[mingulov]

It would be nice. After a brief check - it is even worse now, as #1752 has broken some existing imgtool unittests - so even existing tests are already partially broken as they are not executed by CI. I have created that #1819 as a 1st step to have better imgtool test.

[davidvincze]

It would be nice. After a brief check - it is even worse now, as #1752 has broken some existing imgtool unittests - so even existing tests are already partially broken as they are not executed by CI. I have created that #1819 as a 1st step to have better imgtool test.

We've someone working on further additions to #1819 (in progress)

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[davidvincze]

#1819 is in good state, should be merged soon.