INFRASEC-367: Update conftest version to match yes-k8s-policy (#13)

* INFRASEC-367: Update conftest version to match yes-k8s-policy

Author: cmujurizi

Dockerfile

@@ -1,6 +1,6 @@
-FROM instrumenta/conftest:v0.20.0 as conftest
+FROM openpolicyagent/conftest:v0.37.0 AS conftest
 
-FROM golang:1.15-alpine as builder
+FROM golang:1.15-alpine AS builder
 COPY --from=conftest /conftest /usr/local/bin/conftest
 COPY main.go .
 RUN go build -o /entrypoint main.go