Add tests to make sure the tags are the same as the release version

[skoulouzis]

When getting the latest release, the package name we get is

ci-d25d5645a355c84cbdf830d7b57876b296d82fb7

While the expected is

v0.0.42

[gpelouze]

@skoulouzis the issue should be gone in v0.0.43

I introduced a bug in PR #111 that broke CI. (I had tested it manually, but the issue didn’t show up before the merge and release.)

I have reverted PR #111 and created a new release. Will try to solve #103 with another PR.

[gpelouze]

Sanity checks for image tags would indeed be good. We should also test for issues like #112.