Makefile.am: Also ship test/minimal-test.conf in release tar ball

Without this file some tests fail. (But these are only active when the
testsuite is run as root, which probably explains why this wasn't
noticed earlier.)

Fixes: bafda99 ("test/rauc.t: add basic install tests")
Signed-off-by: Uwe Kleine-König <ukleinek@debian.org>

Makefile.am

@@ -174,6 +174,7 @@ EXTRA_DIST += tap-t \
 	      test/openssl-ca \
 	      $(wildcard test/*.raucb) \
 	      $(wildcard test/*.raucm) \
+	      test/minimal-test.conf \
 	      test/rauc.t \
 	      test/rootfs.raucs \
 	      test/sharness.sh \