Actually use emptydir mount when persistence is disabled

[xyzzyz]

Description

In #2124, an emptydir was mounted when persistence.enabled: false is set. However, this is not enough to make registry work: it crashloops as in issue #1998:

Configuration error: error parsing /etc/docker/registry/config.yml: no storage configuration provided

This is fixed by setting the env variable specifying storage config even if persistence is disabled:

Related Issue

Fixes #1998

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

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[AustinAbro321]

Hey, really appreciate this PR, and this is a bug. The persitence.enabled block on there was added specifically with a s3 backend in mind. I'm not sure if this change would break that use case, but the team and I will need to add a test to the Zarf repo first before I'd feel comfortable with this change. Marking this as blocked for now, and I will circle back when that test is merged.

[xyzzyz]

To provide some context, I use this to bootstrap Zarf on a cluster where there's no PV provisioner available. The way I do it is to install Rancher's local-path-provisioner as part of Zarf init package:

components:
  # This package moves the injector & registries binaries
  - name: zarf-injector
    required: true
    import:
      path: zarf/packages/zarf-registry

  # Creates the temporary seed-registry with ephemeral PV to install local path provisioner
  - name: zarf-seed-registry
    required: true
    import:
      path: zarf/packages/zarf-registry
    actions:
      onDeploy:
        before:
          - cmd: echo "false"
            setVariables:
              - name: REGISTRY_PVC_ENABLED


  # Creates the temporary seed local path provisioner with ephemeral PV to install local path provisioner
  - name: seed-local-c-provisioner
    required: true
    import:
      path: zarf-local-path-provisioner

  # Creates the permanent registry
  - name: zarf-registry
    required: true
    import:
      path: zarf/packages/zarf-registry
    actions:
      onDeploy:
        before:
          - cmd: echo "true"
            setVariables:
              - name: REGISTRY_PVC_ENABLED

  # Reinstall local path provisioner to get its image inserted into permanent registry
  - name: local-path-provisioner
    required: true
    import:
      path: zarf-local-path-provisioner

  # Creates the pod+git mutating webhook
  - name: zarf-agent
    required: true
    import:
      path: zarf/packages/zarf-agent

Without this, I'd need to make local-path-provisioner installation part of pre-Zarf process.