Upd ENV syntax

Author: DTLP

Dockerfile

@@ -1,7 +1,7 @@
 FROM golang:1.24-alpine AS build
 WORKDIR /go/src/github.com/utilitywarehouse/gcp-disk-snapshotter
 COPY . /go/src/github.com/utilitywarehouse/gcp-disk-snapshotter
-ENV CGO_ENABLED 0
+ENV CGO_ENABLED=0
 RUN apk --no-cache add git &&\
   go get -t ./... &&\
   go test ./... &&\