Improve the automation to upload proper dist tarballs

[stappersg]

... Separately, we need to improve the automation to upload proper dist tarballs, since the GitHub release system automatically used the tip of the tree, rather than the files I wanted to upload.

Originally posted by @robbat2 in #185 (comment)

[stappersg]

Time will tell what advice was provided.

In others words: Those with ideas about this, are welcome to provide their two cents.

[RICCIARDI-Adrien]

Can you provide more information about what you want to do ?
What kind of files do you want to generate ? Maybe the same files than in the 2.19 release https://github.com/radvd-project/radvd/releases/tag/v2.19 ?

[robbat2]

make dist && make sign -> GitHub Release automation.

[stappersg]

make dist -> GitHub Release automation.

Acknowledge

make sign -> GitHub Release automation.

Please, pretty please, prevent that private key material is needed on GitHub servers.

[robbat2]

See the PR, that's pretty much all I had in mind, gh release covers it.

[stappersg]

See the PR, that's pretty much all I had in mind, gh release covers it.

And with MR #215 there is no need to keep this issue open.