chore: fixes env in Dockerfile

Dockerfile

@@ -53,10 +53,8 @@ ARG TARGETOS TARGETARCH
 # Generate protos
 RUN go generate
 
-ENV GOEXPERIMENT=jsonv2
-
 # Build binary
-RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -ldflags "-s -w -X github.com/amir20/dozzle/internal/support/cli.Version=$TAG" -o dozzle
+RUN GOEXPERIMENT=jsonv2 GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -ldflags "-s -w -X github.com/amir20/dozzle/internal/support/cli.Version=$TAG" -o dozzle
 
 RUN mkdir /data