ci: Simplify usage directions

While discussing usage of head.hackage with Simon it was pointed out that it would be simpler for users if there were a single command which could be invoked to add head.hackage to a project. Here we refactor the cabal.project snippets to make this feasible. In particular, we now provide three files:

• repo.project contains the minimal snippet which just defines the source-repository stanza
• cabal.constraints contains the version constraints and allow-newer declaration
• cabal.project is the concatenation of both

We can then instruct users to simply curl cabal.project into their cabal.project.local file.

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• d76aa85d - Fix name

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approved this merge request

Getting Simon to use head.hackage will be a game-changer, so I support any efforts in that direction.

approved this merge request

added 51 commits

• d76aa85d...a5f357c0 - 49 commits from branch master
• 6085384f - ci: Simplify usage directions
• 39ae59ac - Fix name

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mentioned in merge request homepage!29

approved this merge request

added 4 commits

• 39ae59ac...769579ca - 2 commits from branch master
• 4739ee1a - ci: Simplify usage directions
• 83ad8179 - Fix name

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merged