[feature] Compose applied configuration in one profile

From this thread: https://github.com/conan-io/tribe/pull/34#discussion_r862742661

The idea is to provide a way to “freeze” the applied profiles (host + build) by combining all the inputs provided, so with just one file you could reproduce a build. Some ideas:

With a different command: conan profile compose --profile:h=foo -s:h arch=x86 -c myconf=1 --profile_out:h=profile_host_windows_x86.txt

Directly with arguments: conan lock create . --profile:h=foo -s:h arch=x86 -c myconf=1 --profile_out:h=profile_host_windows_x86.txt

[ytimenkov]

Yes, an extra file produced on a side would help with the use-case in the tribe comment.

Having profile_out in same commands as lockfile-out is less typing and maybe somewhat convenient (at least conan create / conan install --build).

But otherwise a separate command is also fine. Then the workflow to create a package on CI would be profile create -> lockfile create -> create, each taking output from the previous “stage”.

[memsharded]

It would promote “out of source builds” (e.g. don’t conan install in your source folder, one build / install folder per profile) which is good practice anyways.

Fortunately, with layout() now most builds are automatically “out-of-source” (at least they are moved to a build folder, not polluting the project root).

Good use-case I didn’t think about. I think conaninfo.txt was pretty close to it.

conaninfo.txt will not longer be locally generated in 2.0.