Allow SHA-1 signatures in gating tests, too

28cd304e9d enabled SHA-1 signatures in upstream
test suite so RPM check passes. Enable SHA-1 signatures in gating tests,
too.

resolves: rhbz#2172399

.gitignore

@@ -44,3 +44,5 @@
 /cryptography-36.0.0-vendor.tar.bz2
 /cryptography-36.0.1.tar.gz
 /cryptography-36.0.1-vendor.tar.bz2
+/artifacts
+/tests/artifacts

tests/tests.yml

@@ -16,6 +16,7 @@
     - python3-pytest-subtests
     environment:
       PYTHONPATH: "{{ srcdir }}/vectors"
+      OPENSSL_ENABLE_SHA1_SIGNATURES: "yes"
     tests:
     - remove_hypothesis:
         # remove tests that depend on python3-hypothesis package