"Listen" to conda recommendation to use some other solver upon conda install failing; stderr output from "conda install" would be captured and logged

[yarikoptic]

• ref: git-annex -m conda installation fails in CI #206

• feat(miniconda): --run to run arbirary commands to possibly tune up that miniconda installation #209 seems could provide a workaround but I think we should test/workaround within datalad-installer without requiring adjustment of each similar invocation

TODOs

• ensure CI scenario run fails
• provide a fix within code

[yarikoptic]

with classic solver it took awhile but did manage to perform the drill. So I think this is a good and generic (not git-annex specific) solution of "listen to what conda says", so let's proceed with this.

[yarikoptic]

osx seems to have issues with brew which is unrelated to these changes, so I will just wait for appveyor and then proceed.

==> cabal v2-install --flags=+S3
Last 15 lines from /Users/runner/Library/Logs/Homebrew/git-annex/02.cabal:
           {destination = Network.Wai.Middleware.RequestLogger.Logger
                            $ loggerSet logger,
            outputFormat = Apache FromSocket}’
      In a stmt of a 'do' block:
        logWare <- mkRequestLogger
                     def
                       {destination = Network.Wai.Middleware.RequestLogger.Logger
                                        $ loggerSet logger,
                        outputFormat = Apache FromSocket}
    |
247 |     logWare <- mkRequestLogger def
    |                                ^^^...
Error: [Cabal-7125]
Failed to build yesod-core-1.6.26.0 (which is required by git-annex-10.20241031). See the build log above for details.

[yarikoptic]

appveyor is actually ok - still busy on that lengthy ==> cabal v2-install --flags=+S3 in one run, again, unrelated but all rest is good, so I will proceed to see if we do address datalad testing issue

• Fix matrix runs with recent git-annex in conda-forge datalad#7670