Update CI configurations

[kota2and3kan]

Description

This PR updates the manifests file for CI as follows:

• Change the container image of ScalarDL Auditor.
  • Recently, we updated the default container image of ScalarDL on the Helm Chart side. Now, it uses ghcr.io/scalar-labs/scalardl-auditor-byol by default, which requires a license key to run. However, in the CI environment, we don't set the license key. So, the CI fails.
  • To address this issue, I specified the container image ghcr.io/scalar-labs/scalardl-auditor explicitly. This image does not require the license key since it's for internal developers.
• Set imagePullSecrets for ScalarDB Server.
  • Recently, we updated the visibility of the ScalarDB Server container registry from public to private because it's already deprecated. As a result, we need credentials to pull the container image of ScalarDB Server.
  • To address this issue, I specified the imagePullSecrets to set credentials. This configuration allows the CI environment to pull the private container images.

Please take a look!

Related issues and/or PRs

• https://github.com/scalar-labs/scalar-admin-for-kubernetes/actions/runs/14701917832/job/41252919172
• https://github.com/scalar-labs/scalar-admin-for-kubernetes/actions/runs/14702584212/job/41254991642

Changes made

• Set ghcr.io/scalar-labs/scalardl-auditor in the custom values file for CI.

Checklist

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A

[brfrn169]

LGTM! Thank you!

[kota2and3kan]

Copilot Test!

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This pull request introduces updates to Kubernetes manifests for ScalarDB and ScalarDL Auditor to enhance configuration flexibility and facilitate container image management. The most notable changes involve the addition of imagePullSecrets for ScalarDB and specifying the container image repository for the ScalarDL Auditor.

Updates to ScalarDB manifest:

• Added imagePullSecrets to the ScalarDB manifest to enable pulling container images from private registries. (.github/manifests/scalardb.yaml, .github/manifests/scalardb.yamlR2-R3)

Updates to ScalarDL Auditor manifest:

• Introduced an image section in the ScalarDL Auditor manifest, specifying the repository for the auditor container image. (.github/manifests/scalardl-audit.yaml, .github/manifests/scalardl-audit.yamlR2-R3)

[feeblefakie]

LGTM! Thank you!

[jnmt]

LGTM, thank you!