Ensure setup for reproducible builds when testing

by adding a changes file, enabling changelog handling and passing a
release when running build during test so we can extract
SOURCE_DATE_EPOCH from these.

Without this it might fail when the distribution where the test is
running is set up to require SOURCE_DATE_EPOCH when rpm is called for
building.

test/common

@@ -101,6 +101,7 @@ run_build()
 	set -- $linux32 $SU_WRAPPER \
 		$BUILD_DIR/build \
 		--root "${build_root}" \
+		--changelog --release 5.23 \
 		"${repos[@]}" \
 		"${build_args[@]}"
 	echo "$@"

test/libdummy1.changes

@@ -0,0 +1,5 @@
+-------------------------------------------------------------------
+Mon Feb 19 08:31:23 UTC 2024 - openSUSE <[email protected]>
+
+- package for testing, build date may be incorrect as this might not be updated
+