DBaaS: DB cluster creation fails with unreleased version of pmm-server

User impact:

DB cluster creation fails with unreleased versions of pmm-server

Steps to reproduce:

Start dev-latest pmm-server (or a FB which has 2.30.0 version of pmm-server)
Try to create a DB cluster in dbaas

Actual result:

Tries to pull image that doesn't exist yet

Normal Pulling 39m (x3 over 39m) kubelet Pulling image "percona/pmm-client:2.30.0"
Warning Failed 39m (x3 over 39m) kubelet Failed to pull image "percona/pmm-client:2.30.0": rpc error: code = Unknown desc = Error response from daemon: manifest for percona/pmm-client:2.30.0 not found: manifest unknown: manifest unknown
Warning Failed 39m (x3 over 39m) kubelet Error: ErrImagePull
Warning Failed 39m (x3 over 39m) kubelet Error: ImagePullBackOff
Normal BackOff 4m51s (x153 over 39m) kubelet Back-off pulling image "percona/pmm-client:2.30.0"

Expected result:

If pmm-server version is unreleased, perconalab/pmm-client:dev-latest should be pulled

Workaround:

Run pmm-server with env var

 -e PERCONA_TEST_DBAAS_PMM_CLIENT=percona/pmm-client:2.29.0

Implementation Details:

• If PERCONA_TEST_DBAAS_PMM_CLIENT env variable is set, use the value from there.
• If it’s a released version: use the released version
• If it’s an unreleased version(has some suffix in the version value): use dev-latest