The `test/cases/api.sh` script relied on environment variables specific
to Jenkins for detecting it if is running in a CI environment. If this
was the case, it used other environment variables to construct a
predictable `TEST_ID` which could be used for names of resources created
in cloud-provider environment as part of the test. This is important to
ensure that `cloud-cleaner` can "guess" resource names and delete them
in case the test script fails to clean up after itself.
With the move from Jenkins to GitLab CI, this stopped to work and the
script started to generate random `TEST_ID`, which can not be guessed by
the `cloud-cleaner` tool.
Modify the `test/cases/api.sh` to detect the CI environment using the
`CI` environment variable, which is always predefined in the GitLab CI
environment [1].
[1] https://docs.gitlab.com/ee/ci/variables/predefined_variables.html
Signed-off-by: Tomas Hozza <thozza@redhat.com>
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