I haven't tested with our interal github yet as I just finished setting up the operator and a test AWX instance in the OpenShift 4.7 cluster.
As per one of the posts, I created following secrets with our internal CA that's used by LDAP, git and others for HTTPS communication.
oc create secret generic org-ca-cert -n awx-test-ns --from-file=ldap-ca.crt=myorg-CA.pem --from-file=bundle-ca.crt=
myorg-CA.pem
I have not customized the EE docker image yet, I do see that EE container has following mount now with the certificate data
/etc/pki/ca-trust/source/anchors/bundle-ca.crt
I have these entries in the AWX instance YAML
ldap_cacert_secret:
org-ca-cert
bundle_cacert_secret:
org-ca-cert