fix building of amd64 images (#81)

Signed-off-by: Alex Price <[email protected]>

Dockerfile

@@ -1,6 +1,6 @@
 FROM --platform=$BUILDPLATFORM golang:1.22 as builder
 ARG TARGETPLATFORM
-ARG ENVVAR
+ARG ENVVAR=CGO_ENABLED=0
 WORKDIR /go/src/github.com/atlassian-labs/cyclops
 COPY go.mod go.sum Makefile ./
 COPY cmd cmd