Add package signing documentation

Add documentation for Signed Packages:

• what / how
• how to enable
• how to verify

Should this get a review by someone on the community team for readability?

cc @briann @gitlab-build-team

mentioned in issue #2537 (closed)

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• 2fcac15f...80d738a3 - 215 commits from branch master
• 859684cd - Docs: Add documentation of Signed Packages

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• f89be87e - Docs: Signed Packages - fix links

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• e2de0b04 - Docs: signed packages: from feedback

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Overall looks great @WarheadsSE, thanks for putting this together! Just a few comments.

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• b3b68400 - Docs: update/package_signatures typo fix

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unmarked as a Work In Progress

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• 7ef510a7 - docs: update/package_signatures - update pubkey file name

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assigned to @twk3

I believe that other than the moving of the debsigs configuration script, we're good to go here.

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• 5f7d8b4a - Docs: update package signing to scripts/gitlab-debsigs.sh

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One comment, otherwise looks good to me

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• 48fd0da3 - Docs: update/package_signatures: document checking state

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resolved all discussions

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• 06cee2c1 - docs: update/package_signature: use verbose rpm query of key

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approved this merge request

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changed milestone to %9.5

merged

mentioned in commit 31271e69

mentioned in commit 1edaa31f

mentioned in commit e3bc05a1

Picked into 9-5-stable for 9.5 RC3

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