Add comment for go1.15 pin in pki package
Add comment for go1.15 pin in pki package

 The Subject Key Identifier and Authority Key Identifier extensions are
 necessary on certificate authorities. The "crypto/x509" package adds
 these automatically since Go 1.15. We need to ensure that certificates
 generated by our PKI have these two fields. We should drop this build
 constraint after our tests look for the fields explicitly.

https://github.com/crunchydata/postgres-operator/commit/d55f8c6595e99e83a8e384a2314849064412689d

Issue: [sc12565]

CrunchyData/postgres-operator,CrunchyData/postgres-operator