Final landlock fixup, everything should be fine now.

• Fixed an issue where sign-all did not report a non-zero exit code when something failed
• Fixed and issue where we couldn't write to a file with landlock
• Fixed an issue where --json would print the human readable output and the json
• Fixes landlock for UKI/bundles by disabling the sandbox feature
• Some doc fixups that mentioned /usr/share/

Generated list of changes

What's Changed

• 91-sbctl.install: Unconditionally remove file from database by @chenxiaolong in #341
• sbctl: Fix human readable output being printed when using --json by @chenxiaolong in #342
• Ensure landlock works for signing entries by @Foxboron in #344

New Contributors

• @chenxiaolong made their first contribution in #341

Full Changelog: 0.15.3...0.15.4