fix(influxdb3-ent): use image entrypoint and support extra env variables

[alespour]

Closes #798

• uses image entrypoint for containers. One of the benefits is that INFLUXDB3_UNSET_VARS works now.
• adds extraEnv values support; global with per-component overrides

[Copilot]

Pull request overview

This PR updates the influxdb3-enterprise Helm chart to rely on the container image entrypoint (enabling INFLUXDB3_UNSET_VARS) and adds per-component extraEnv support so environment overrides can be targeted to specific components.

Changes:

• Replace command: /bin/sh -c ... with args: across component StatefulSets to allow the image entrypoint to run, and introduce POD_NAME via the Downward API for stable --node-id.
• Add component-scoped extraEnv in values.yaml, document it in the README, and implement global+component env rendering in _helpers.tpl.
• Add CI coverage values for component extraEnv, bump chart/app versions, and update cert-manager install/wait logic in CI.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
charts/influxdb3-enterprise/values.yaml	Adds per-component extraEnv and clarifies global vs component env behavior.
charts/influxdb3-enterprise/templates/_helpers.tpl	Introduces podNameEnv and componentExtraEnv helper templates.
charts/influxdb3-enterprise/templates/ingester-statefulset.yaml	Switches to args, uses POD_NAME, and renders merged extra env.
charts/influxdb3-enterprise/templates/querier-statefulset.yaml	Switches to args, uses POD_NAME, and renders merged extra env.
charts/influxdb3-enterprise/templates/compactor-statefulset.yaml	Switches to args, uses POD_NAME, and renders merged extra env.
charts/influxdb3-enterprise/templates/processor-statefulset.yaml	Switches to args (incl. init container), uses POD_NAME, and renders merged extra env.
charts/influxdb3-enterprise/README.md	Documents global and component-specific extraEnv and updates parameters table.
charts/influxdb3-enterprise/ci/component-extra-env-values.yaml	Adds CT install values to exercise per-component env + entrypoint unset behavior.
charts/influxdb3-enterprise/Chart.yaml	Bumps chart version and appVersion.
.github/workflows/helm-charts-test.yaml	Updates cert-manager install URL and replaces sleep with kubectl wait.

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 10 changed files in this pull request and generated no new comments.

[bednar]

Requesting changes for the component extraEnv override behavior. The current implementation can render duplicate Kubernetes env entries for the same name, which is brittle for apply/GitOps/server-side tooling and does not actually model a clean override.

[bednar]

Looks good. I re-reviewed the updated extraEnv override implementation and verified the rendered manifests no longer contain duplicate env names for the CI values. Existing review threads are already resolved.