Replaces the broken curl ... https://0x0.st hint with an integrated archinstall share-log command that uploads /var/log/archinstall/install.log to paste.rs and prints a shareable URL. Also updates the same hint in the README, the bug report docs, and the GitHub bug issue template, so all four user-facing references now point to the working command.

Refs #4396 (0x0.st has disabled uploads). Supersedes #4507, which removes the hint without offering a replacement.

Why paste.rs

• Text-oriented pastebin with extension-based syntax highlighting, so install.log renders as a readable page rather than a raw download
• 10 MiB upload limit (well above realistic install.log sizes)
• Curl-friendly, no account, no server-side state to maintain

The endpoint is referenced exactly once - a constant in archinstall/lib/output.py. If a self-hosted paste service is set up later, or 0x0.st returns, swapping it is a one-line change.

Behavior

$ archinstall share-log
About to upload /var/log/archinstall/install.log (12345 bytes) to https://paste.rs
The log may contain hostname, mirror URLs, package list and partition layout.
The uploaded paste is public.
Continue?
https://paste.rs/abc.def

• Runs as a subcommand (archinstall share-log), not a flag - it is a standalone command, not an installer option
• Runs before root check so non-root users can share logs too
• TUI confirmation via ConfirmationScreen (consistent with the rest of archinstall)
• Diagnostics go through info(); only the final URL goes to raw print() so it can be piped (archinstall share-log | xclip -sel clip)
• Logs exceeding 10 MiB are truncated from the bottom up (latest entries kept) instead of refusing to upload
• File-not-found, empty file, network failure and unexpected response are each handled with a clear message and non-zero exit

Test plan

• archinstall share-log on a live ISO - URL is printed and the paste is readable
• archinstall share-log answering No - exits cleanly without uploading
• archinstall share-log with install.log missing - reports the error and exits non-zero
• archinstall share-log with no network - reports the error and exits non-zero
• Trigger an install error and confirm the hint says archinstall share-log