Tag products

[marcwrobel]

Define rules for tags in CONTRIBUTING.md, and add tags (aka labels) to products (relates to #2225).

This commit focus on a limited set of tags, meaning:

• tags to set a product family such as linux-distribution, web-browser, mobile-phone or web-server,
• tags to set a product vendor such as adobe, amazon or apache,
• tags to set a runtime dependency such as java-runtime, javascript-runtime or php-runtime.

How tags are displayed on the website will be handled later.

[adriens]

Could we get a tag for the tea.xyz package ?

For example for sqllite :

• endoflife.date key : sqlite
• tea.xyz key : sqlite.org

👇

• 🔗 Bridges between tea.xyz and endoflife.date 🧑‍🤝‍🧑  pkgxdev/pantry#1021

[captn3m0]

We already support identifiers for other package ecosystems via the identifiers key, which links to various PURLs. There isn't a tea PURL type yet, but one could be create fairly easily, and we can add the corresponding PURLs in the identifiers key post that.

So, it could be as simple as:

identifiers:
- purl: pkg:tea/python.org

[marcwrobel]

Rebased against master to include #2759.

[marcwrobel]

Rebased against master, conflicts resolved.

[marcwrobel]

Rebased with master, conflicts resolved.

[marcwrobel]

Rebased with master, conflicts resolved. @captn3m0 could you have a look at this PR asap. It's a little bit annoying to maintain it.

[marcwrobel]

@captn3m0 could you have a look at this PR this week ? It's a simple one, but it is a little bit annoying to maintain it.

[marcwrobel]

Conflicts resolved again. @captn3m0 I am merging this PR as it is annoying to maintain. I did a full review and its LGTM, but feel free to revert or amend if needs be.

This PR also fixes an issue introduced by the merge of the IBM AIX PR (validation workflow was did not work). #2859 should solve this.