Remove temporary image after test run

[robson90]

Closes: #173

[dasniko]

Thanks. First approach. ;)
This removes the named image, but as for each test an image is created with @BeforeEach the first ones become dangling images and won't be removed in the @AfterAll method.
Idea: either create only one image/container and only one test, as in the first 3 test methods, you just start up the same image with no difference and inspect return value and logs. In the 4th method you use a regular container, no custom image.
Or, create a separate image for each test which you remove afterwards again.

[robson90]

Before Test:

While Test is running:

Some seconds after the Test has finished:

That approach does also work, when Test is failing. I think the "real" problem, is that my test wants to name 3 image the same(paired with the concurrent execution). That is silently failing. If you don't care about the names while running the tests, this solution should be sufficient.

Please let me know, what you think.

[dasniko]

seems to do the trick

[dasniko]

thanks, @robson90