refactor: add startup probe

Walkthrough

The changes in this pull request primarily involve an update to the greptimedb-cluster Helm chart. The version number has been incremented from 0.2.27 to 0.2.28 across various files. Significant modifications include the addition of startupProbe configurations to multiple pod templates in the README.md, cluster.yaml, and values.yaml files. These changes enhance the health check capabilities of the GreptimeDB cluster by allowing Kubernetes to verify the successful startup of applications before directing traffic to them.

Changes

File Path	Change Summary
`charts/greptimedb-cluster/Chart.yaml`	Version updated from `0.2.27` to `0.2.28`.
`charts/greptimedb-cluster/README.md`	Version updated from `0.2.27` to `0.2.28`; added `startupProbe` to multiple pod templates.
`charts/greptimedb-cluster/templates/cluster.yaml`	Added `startupProbe` to `main` templates for `base`, `frontend`, `meta`, `datanode`, and `flownode`.
`charts/greptimedb-cluster/values.yaml`	Added `startupProbe: {}` in multiple sections for `base`, `frontend`, `meta`, `datanode`, and `flownode`.

Possibly related PRs

#147: This PR adds a readinessProbe configuration to various components, which is related to the health check enhancements in the main PR that introduces startupProbe configurations.
#158: This PR updates the Chart.yaml version, which is relevant as it follows the same versioning pattern as the main PR's version increment.
#176: This PR adds configurations for probes, which aligns with the main PR's focus on enhancing health check capabilities through startupProbe.
#175: This PR updates the versioning information in the Chart.yaml, similar to the version increment in the main PR.
#164: This PR also involves a version bump in the Chart.yaml, which is consistent with the versioning changes in the main PR.

Suggested reviewers

daviderli614

Poem

🐰 In the garden where the data flows,
A startupProbe now brightly glows.
With version bumped, our cluster's keen,
Ready to serve, a healthy scene!
Hops of joy, we celebrate,
In Kubernetes, we elevate! 🌱

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GreptimeTeam / helm-charts