add proxy prefix

[bxy4543]

🤖 Generated by Copilot at c0e672b

Summary

🌐🛠️⬇️

Added support for installing sealos from a proxy URL. Added a new --proxy-prefix option to ./scripts/cloud/install.sh and modified scripts/install.sh to use it.

To install sealos from a proxy
We added a new option, --proxy-prefix
It sets PROXY_PREFIX in the shell
And prepends it to DOWNLOADER_PREFIX as well
So the scripts/install.sh script can fetch the binary

Walkthrough

• Add --proxy-prefix option to ./scripts/cloud/install.sh to allow user to specify a proxy URL for sealos binary installation (link, link, link, link)
• Modify ./scripts/cloud/install.sh to use proxy_prefix variable and pass it to curl command as PROXY_PREFIX environment variable (link)
• Modify scripts/install.sh to use PROXY_PREFIX environment variable and prepend it to DOWNLOADER_PREFIX variable (link)

[sealos-ci-robot]

🤖 Generated by lychee action

Summary

Status	Count
🔍 Total	970
✅ Successful	377
⏳ Timeouts	0
🔀 Redirected	0
👻 Excluded	592
❓ Unknown	0
🚫 Errors	0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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