chore: add mysql-client and grafana in docker image

[dracoooooo]

Rationale

Close #1285

Install mysql-client and grafana when building docker image.

Detailed Changes

1. Install mysql-client and grafana in Dockerfile.
2. Add docker/datasource.yml as grafana default datasource.
3. Start grafana server in entrypoint.sh.

mysql-client

In the docker container:

grafana

Start the container and access http://<your_ip>:3000

Test Plan

None.

[jiacai2050]

Hi, in description you said test plan is none, would me mind to insert some data, and see if mysql datasource works?

There are example telling you how to insert in readme.

• https://github.com/apache/incubator-horaedb?tab=readme-ov-file#create-table-and-writeread-data

[dracoooooo]

Hi @jiacai2050. MySQL datasource works well in my local test with the queries in readme.

[jiacai2050]

LGTM

[jiacai2050]

Thanks for your contribution.