Add persistent volume for repository cache

[lachmanfrantisek]

Add persistent volume to the worker for repository-cache.

• The only option on OpenShift Online is AWS EBS provisioning
  supporting only ReadWriteOnce access:
  https://docs.openshift.com/online/pro/architecture/additional_concepts/storage.html#pv-restrictions
  Because of that, we need to have one repository-cache for each worker.

• The volume is mounted to /repository-cache path.

• For now, the content of the cache will be maintained (adding/updating) manually.

[softwarefactory-project-zuul]

Build succeeded.

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[jpopelka]

ok

[TomasTomecek]

I wonder if we should only keep trying this on stg before we feel confident in bringing it to prod

also, do we have documentation for how to update the cache? (asking b/c ReadWriteOnce is scaring me)

[lachmanfrantisek]

I wonder if we should only keep trying this on stg before we feel confident in bringing it to prod

Empty cache on prod should not cause any problems. So we can try first on stage without any change in deployment.

also, do we have documentation for how to update the cache? (asking b/c ReadWriteOnce is scaring me)

• If you mean the Once in the type, it means The volume can be mounted as read-write by a single node. Yes, you've scared me a bit..;)
• And regarding the process, we can start with the manual approach as we've discussed.

[softwarefactory-project-zuul]

Build failed.

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[softwarefactory-project-zuul]

Build succeeded.

• pre-commit : SUCCESS in 3m 24s
• deployment-tests : SUCCESS in 7m 28s

[lachmanfrantisek]

@jpopelka Can you please take a look? What we need is to define for each worker:

• one PVC in the prod/stage namespace and mount it
• one PVC in the sandbox namespace that will be mounted through sandcastle using SANDCASTLE_REPOSITORY_CACHE_VOLUME env var of the worker.

[jpopelka]

LGTM with a suggestion

[softwarefactory-project-zuul]

Build succeeded.

• pre-commit : SUCCESS in 4m 05s
• deployment-tests : SUCCESS in 8m 49s

[lachmanfrantisek]

I am dropping the Configure repository-cache volume for sandcastle commit, this needs to be done elsewhere: packit/packit-service#1170

[softwarefactory-project-zuul]

Build succeeded.

• pre-commit : SUCCESS in 3m 31s
• deployment-tests : SUCCESS in 8m 13s

[softwarefactory-project-zuul]

Build succeeded (gate pipeline).

• pre-commit : SUCCESS in 3m 09s