docs: document env vars and fix warnings

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mentioned in merge request !2505 (merged)

added 3 commits

• 17713cea - CI: docs: fail on warning
• 96ebd9bc - docs: add env vars page with PMB_SUDO
• 9bf79a3b - docs: document PMB_APK_FORCE_MISSING_REPOSITORIES

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approved this merge request

Thanks!

added 6 commits

• 07f04ae1 - 1 commit from branch master
• 268478a2 - docs/api/pmb.commands: fix "failed to import" (MR 2506)
• 77125ff9 - docs: fix 'WARNING: Title underline too short' (MR 2506)
• 559710c6 - CI: docs: fail on warning (MR 2506)
• 1dcb68bd - docs: add env vars page with PMB_SUDO (MR 2506)
• 3e18183a - docs: document PMB_APK_FORCE_MISSING_REPOSITORIES (MR 2506)

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enabled an automatic merge when all merge checks for 3e18183a pass

canceled the automatic merge

merged