test: Build and download podman as a test asset

The pasta_podman/bats test scrpt downloads and builds podman, then runs its
pasta specific tests.  Downloading from within a test case has some
drawbacks:
 * It can be very tedious if you have poor connectivity to the server
 * It makes a test that's ostensibly for pasta itself dependent on the
   state of the github server
 * It precludes runnning the tests in an isolated network environment

The same concerns largely apply to building podman too, because it's pretty
common for Go builds to download dependencies themselves.  Therefore move
the download and build of podman from the test itself, to the Makefile
where we prepare other test assets.

To avoid cryptic failures if something went wrong with the build, make
running the test dependent on having the built podman binary.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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