tests/riotboot_flashwrite: add TEST_EXTRA_FILES

Author: fjmolinas

tests/riotboot_flashwrite/Makefile

@@ -79,6 +79,12 @@ ifeq (nrf52dk,$(BOARD))
   USEMODULE += nrfmin
 endif
 
+# The test needs the linked slot binaries without header in order to be able to
+# create final binaries with specific APP_VER values. The CI RasPi test workers
+# don't compile themselves, thus add the required files here so they will be
+# submitted along with the test jobs.
+TEST_EXTRA_FILES=$(SLOT_RIOT_ELFS)
+
 # Change this to 0 show compiler invocation lines by default:
 QUIET ?= 1