fix(dependencies): Ignore safety false-positives

Ignore Safety ID 51457 dues to a false-positive reported here: pytest-dev/py#287

docker-entrypoint.sh

@@ -7,6 +7,7 @@ set -o pipefail
 bandit -r vcert/
 
 # ID 40291 is pip, ignore so we can still test python 2.7
-safety check -i 40291
+#Ignoring false-positive issue with pytest. ref: https://github.com/pytest-dev/py/issues/287
+safety check -i 40291 -i 51457
 
 pytest -v --junit-xml=junit.xml --junit-prefix=`python -V | tr ' ' '_'` --cov=vcert --cov=vcert.parser --cov=vcert.policy --cov-report term --cov-report xml