Fix OCI registry login concurrency issue

[jrhouston]

The provider should log into each registry only once. I've added a mutex here so that parallel login attempts don't interfere with each other.

I've also added a test case which spins up a passworded OCI registry and uses it to create multiple releases.

Fixes #845

Description

Acceptance tests

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Release Note

Release note for CHANGELOG:

Fix OCI registry concurrent login issue 

References

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