Disable cgo

As part of the Go 1.20 release it seems like the default for `CGO_ENABLED` is no longer carried over from the tools. This leads to linking issues on systems that use different versions of glibc from what the base image uses. See golang/go#58550 for more details.

This change should fix cosmonic-labs#16

Dockerfile

@@ -2,6 +2,7 @@ FROM golang:1.20 as builder
 WORKDIR /netreap
 COPY . /netreap
 ARG VERSION
+ENV CGO_ENABLED 0
 RUN go build -ldflags "-s -w -X 'main.Version=$VERSION'"
 
 FROM gcr.io/distroless/base-debian11