Add new test suite for build

Most build testing should be done in Buildah's test
suites, but we should have a minimal amount of tests,
especially testing the parts that are different like
layers and squash.  Also the CLI argument handling
of things like the context directory that we've had
issues reported.

This first chunk does a basic test and then checks for
context directory being a file and squash iterations.

More to be added as time goes by.

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

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