[aws-for-fluent-bit] Add optional luaScripts ConfigMap and volume mount

[dundysm]

Issue

Fixes #1307

Description of changes

Optional luaScripts values, ConfigMap, DaemonSet mount at /fluent-bit/scripts/. Empty default is a no-op. Rolling update via checksum annotation when scripts are set.

Checklist

• Added/modified documentation as required (such as the README.md for modified charts)
• Incremented the chart version in Chart.yaml for the modified chart(s)
• Manually tested. Describe what testing was done in the testing section below
• Make sure the title of the PR is a good description that can go into the release notes

Testing

Repo make verify (scripts/validate-charts.sh, validate-chart-versions.sh, lint-charts.sh) — pass. aws-for-fluent-bit version 0.2.0 → 0.2.1. make package produced aws-for-fluent-bit-0.2.1.tgz.

helm lint stable/aws-for-fluent-bit — pass (default and with a luaScripts override).

helm template test-fb stable/aws-for-fluent-bit --namespace kube-system (default luaScripts: {}) — no luascripts ConfigMap, no /fluent-bit/scripts/ volume or volumeMount, no checksum/luascripts.

helm template with a multiline helpers.lua override — ConfigMap YAML parses; script body is in data.helpers.lua; DaemonSet has the luascripts volume, mount at /fluent-bit/scripts/, and checksum/luascripts.

kubeconform -strict -ignore-missing-schemas and kubeval --strict --ignore-missing-schemas on default and lua override renders — pass.

Did not apply to a cluster (no EKS/kind install, no log-shipping e2e).

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dundysm]

@PettitWesley @mforutan this adds optional luaScripts on aws-for-fluent-bit for #1307 (ConfigMap + mount at /fluent-bit/scripts/). Default {} is a no-op.

make verify / make package, helm lint/template, and kubeconform/kubeval are green on the renders.

Happy to change the values shape if you'd rather this reuse volumes / volumeMounts instead of a dedicated key.