fix ci errors in circleci

[gioragutt]

Fixes already:

• fix invalid backslash in .dockerignore that is failing builds
• fix the init-container tests by properly waiting for wiremock to be available before running the decryptor

Missing to make CI pass:

• ~The k8s tests also fail, log lines suggest this may be caused by missing kubectl configuration files (f.e mv: cannot stat '/home/circleci/.kube/config': No such file or directory).~
• kind know issues states that cgroup v2 is only supported on k8s>=1.19. One of the tests in the CI runs k8s 1.18, and the docker environment provided by circleci runs cgroups v2. This explains why 1.18 fails and 1.19&1.20 succeeds.

[gioragutt]

@shaikatz @omerlh sorry for the sudden ping, hope you guys see this.

The CI fails for different reasons, and most of them I fixed, but one I'm not entirely sure how to deal with properly.

In the PR description there's a point about CircleCI running docker with cgroup v2, and it's not supported by k8s v1.18, which is one of the tests in the Kamus CI.

How would you recommend dealing with that? Should we keep support for 1.18 in the CI? Is it worth the effort?

[gioragutt]

cc @yaron-idan