Ensure that TZ setting can work properly in Docker.

[KUMAKAIHA]

Added TZ variable and default TZ variable to Shanghai, providing the variable time zone to the container.
Then I modified the results/telemetry_db. php, which first attempts to obtain the value of TZ from the environment variable. If successfully obtained (i.e. environment variable exists), use this value to set the default time zone for PHP. If the TZ environment variable does not exist, choose to set the default time zone ('Asia/Shanghai ')
To ensure that the data written to the table by SQLite does indeed match the modified time (i.e. the actual time of the set time zone), I explicitly set the value of the timestamp field to the current time zone when inserting data into the speedtest_users table. This tested perfectly in my Docker and everything was fine on my x86 Ubuntu 22.04.4 LTS server. I hope to test and merge this.

[sstidl]

Thank you for your contribution

Please set the default time zone to UTC as this is common practice for global tine.

Also it would be nice to store all times in UTC and convert them on display only. This way it could be achieved that times are always correct for the viewer.

Thank you again
Stefan

[KUMAKAIHA]

感谢您的贡献

请将默认时区设置为 UTC，因为这是全球时段的常见做法。

此外，最好将所有时间都存储在 UTC 中并仅在显示时转换它们。通过这种方式，可以实现时间对观众来说总是正确的。

再次感谢斯蒂芬

I apologize for the misunderstandings I had regarding Forking, committing, and merging on VSCode and GitHub. This confusion may have stemmed from inaccurate Chinese translations. When I attempted to submit changes on VSCode, it seemed like I was pushing my entire localization project to the original repository.

I have now tried to pull the latest version, made separate commits for the changes related to the TZ setting, and have successfully set UTC as the default timezone. Thank you for pointing out the errors. You can now try rebuilding and testing the Docker to confirm the effectiveness of the TZ variable. If my commits are still incorrect, please close this request. I will refork and seek assistance from GPT4 to help me submit the changes.

Thank you once again for your guidance.
KUMAKAIHA

[sstidl]

@KUMAKAIHA i'm sorry, i deleted the dev branch so your PR was closed. could you please resubmit if you have the time.