Add modules to Docker build

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Author: alexellis

Dockerfile

@@ -17,12 +17,14 @@ COPY vendor     vendor
 COPY handler    handler
 COPY version    version
 COPY nats       nats
-COPY main.go  .
-COPY types.go .
-COPY readconfig.go .
+COPY go.mod     .
+COPY go.sum     .
+COPY main.go    .
+COPY types.go   .
+COPY auth.go    .
+COPY .git       .
+COPY readconfig.go      .
 COPY readconfig_test.go .
-COPY auth.go .
-COPY .git     .
 
 ARG go_opts
 
@@ -32,7 +34,7 @@ RUN  VERSION=$(git describe --all --exact-match `git rev-parse HEAD` | grep tags
         --ldflags "-s -w \
         -X github.com/openfaas/nats-queue-worker/version.GitCommit=${GIT_COMMIT}\
         -X github.com/openfaas/nats-queue-worker/version.Version=${VERSION}" \
-        -a -installsuffix cgo -o app .
+        -a -installsuffix cgo -o worker .
 
 # we can't add user in next stage because it's from scratch
 # ca-certificates and tmp folder are also missing in scratch
@@ -41,5 +43,5 @@ FROM --platform=${BUILDPLATFORM:-linux/amd64} gcr.io/distroless/static:nonroot
 
 WORKDIR /
 USER nonroot:nonroot
-COPY --from=build /go/src/github.com/openfaas/nats-queue-worker/app    .
-CMD ["./app"]
+COPY --from=build /go/src/github.com/openfaas/nats-queue-worker/worker    .
+CMD ["/worker"]