remove debug target

Dependencies

• [2] PVBTVPKJ nix needs env vars as absolute paths
• [3] G2ZB6464 first test, not yet in buildprocess
• [4] HX4QYOYA add first evaluations tests

Change contents

• edit in tests/Makefile.am at line 21
  [3.429]→[2.191:223](∅→∅)
  − rob:

  − echo $(TESTS_ENVIRONMENT)