ci: Install kola tests

This builds on
https://github.com/coreos/coreos-assembler/pull/1441
to install our tests rather than running them from the source
directory.  This model will more cleanly allow us to ship
our tests along with a test container or elsewhere, separate
from the source directory.

Also prep for https://github.com/ostreedev/ostree/pull/2048

tests/kola/Makefile

@@ -0,0 +1,13 @@
+DESTDIR ?=
+
+TESTDIRS := $(shell find -mindepth 1 -maxdepth 1 -type d)
+LIBSCRIPTS := $(shell ls *.sh)
+
+KOLA_TESTDIR = $(DESTDIR)/usr/lib/coreos-assembler/tests/kola/ostree/
+
+all:
+	for x in $(LIBSCRIPTS); do bash -n "$${x}"; done
+
+install:
+	install -D -m 0644 -t $(KOLA_TESTDIR) $(LIBSCRIPTS)
+	for x in $(TESTDIRS); do rsync -rlv ./$${x} $(KOLA_TESTDIR)/; done