Fix tzdata not installed issue in termux env

[A1311981684]

📝 Description

In termux env, tzdata is not installed or can be installed by pkg -i command. In the latest version 0.2.5, TZ info is acquired via env param, but since tzdata is not installed in the system, picoclaw fails to work with time correctly. The cron feature is baddly affected by this issue.

🗣️ Type of Change

• [√ ] 🐞 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 📖 Documentation update
• ⚡ Code refactoring (no functional changes, no api changes)

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🔗 Related Issue

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• Reasoning: none

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☑️ Checklist

• [ √] My code/docs follow the style of this project.
• [ √] I have performed a self-review of my own changes.
• [ ×] I have updated the documentation accordingly.

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[sky5454]

https://go.dev/src/time/tzdata/tzdata.go
According to the annotations in the official library

// Importing this package will increase the size of a program by about 450 KB.

For the Android architecture, use Bionic instead of glibc.

Another problem with finding time zones is more likely to be the TZ variable, which is not available on Android

Tips: You could see the /system/usr/share/zoneinfo/tzdata at Android termux

And I recommend you to try the GUI at Android: https://github.com/sipeed/picoclaw_fui/releases

[sky5454]

Tips: You could see the /system/usr/share/zoneinfo/tzdata at Android termux

[sky5454]

TZDATA, It exists on Android, but isn't recognized

[sky5454]

Tips: You could see the /system/usr/share/zoneinfo/tzdata at Android termux

[sky5454]

I found a method that might help you, and it's the standard Android variable read solution
golang/go#20455 (comment)