feat(helm): multi-account support

[cxdy]

Did some noodling and re-thought my approach in #59 / #58

Adds an optional multi-account mode to the latr Helm chart so a single helm release can run one latr Deployment per managed Linode account. Also bumps the chart version to 0.2.0.

This method gives us many latr pods (one process / account) without +N Applications in Argo/Flux/etc.

Behavior

Mode	When	Result
Single-instance (default)	accounts: []	Unchanged: one Deployment / ConfigMap / S
Multi-account	accounts non-empty	One release → N Deployments + ConfigMaps + Secr

Per account

• Resource name from accounts[].name (e.g. personal-account, work-account)
• Optional accounts[].id only if name is omitted → latr-<id> (no special public “customer id” concept)
• configFiles: map of filename → YAML text, mounted at /config
• latr args: -config /config/* (Go filepath.Glob; no shell)
• Or config: as a single latr-native YAML object → config.yaml
• Secrets: inline secrets.* or secrets.existingSecret
• Shared ServiceAccount for the release

[Copilot]

Pull request overview

This PR extends the latr Helm chart to support an optional multi-account mode, enabling a single Helm release (and typically one Argo/Flux app) to deploy one latr Deployment per managed Linode account, each with its own ConfigMap/Secret, while sharing a ServiceAccount.

Changes:

• Add accounts:-driven multi-account rendering (N Deployments, ConfigMaps, Secrets, and per-account PDBs).
• Add support for multi-file config via configFiles (mount under /config, run latr with -config /config/*) in both single-instance and multi-account modes.
• Update chart docs/examples and bump chart version to 0.2.0.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
helm/latr/values.yaml	Documents new accounts structure and optional single-instance configFiles.
helm/latr/templates/secret.yaml	Renders one Secret per account in multi-account mode (or none when existingSecret is used).
helm/latr/templates/poddisruptionbudget.yaml	Creates per-account PDBs in multi-account mode; keeps single-instance PDB behavior.
helm/latr/templates/NOTES.txt	Adds multi-account install notes and adjusts warnings for configFiles.
helm/latr/templates/deployment.yaml	Adds multi-account Deployment rendering and configFiles-based -config /config/* support.
helm/latr/templates/configmap.yaml	Adds per-account ConfigMaps and supports single/multi-account configFiles and embedded config.
helm/latr/templates/_helpers.tpl	Adds multi-account helpers for mode detection, per-account names/labels, and secret name selection.
helm/latr/README.md	Documents chart modes and updates example Vault storage path guidance.
helm/latr/examples/values-multi-account.yaml	Adds a concrete multi-account values example.
helm/latr/Chart.yaml	Bumps chart version from 0.1.0 to 0.2.0.

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