### Motivation:
This patch fixes the bug that there's no chance to disable the so11y in docker container.
### Modifications:
- Remove the default so11y section, and only add it when the environment variable exists.
### Result:
- Users can disable so11y by leaving the `SW_TELEMETRY` empty or set it to `none`
* Add es7 support to docker
* Add es7 to github aciton workflow
* Rename dockerfile
* Update docker-compose
* Update matrix es name
* Set oap tag
* Add document
* Update How-to-build.md