Cirrus: Automate releasing of tested binaries

It's desirable to make archives available of builds containing actual
tested content.  While not official distro-releases, these will enable
third-party testing, experimentation, and development for both branches
(e.g. "master") and pull requests (e.g. "pr3106").

* Add a Makefile targets for archiving both regular podman binaries
  and the remote-client.  Encode release metadata within these
  archives so that their exact source can be identified.

* Fix bug with cross-compiling remote clients for the Windows and Darwin
  platforms.

* Add unit-testing of cross-compiles for Windows and Darwin platforms.

* A few small CI-script typo-fixes

* Add a script which operates in two modes:

  1. Call Makefile targets which produce release archives.
     Upload the archive to Cirrus-CI's built-in caching system
     using reproducible cache keys.

  2. Utilize reproduced cache keys to attempt download of cache
     from each tasks.  When successful, parse the file's
     release metadata, using it to name the archive file.  Upload
     all recovered archives to a publicly accessible storage bucket
     for future reference.

* Update the main testing task to call the script in mode #1 for
  all primary platforms.

* Add a new `$SPECIALMODE` task to call the script in mode #1 for
  Windows and Darwin targets.

* Add a new 'release' task to the CI system, dependent upon all other
  tasks.  This new tasks executes the script in mode #2.

* Update CI documentation

Signed-off-by: Chris Evich <cevich@redhat.com>

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