Changing to build in a smaller container and only package the build Go binary

Dockerfile

@@ -1,17 +1,18 @@
-FROM golang:1.16 AS builder
+FROM golang:1.16-alpine AS builder
 
 WORKDIR /go/src/app
 COPY . .
 
-RUN CGO_ENABLED=0 GOOS=linux go get -d -v . && \
+RUN CGO_ENABLED=0 GOOS=linux \
+	go get -d -v . && \
 	go build -a -tags netgo -o b56
 
-FROM alpine:3.14
+FROM scratch
 
-WORKDIR /app
+WORKDIR /
 COPY --from=builder /go/src/app/b56 .
 COPY ./static ./static
 
 EXPOSE 80
 
-CMD ["/app/b56"]
+CMD ["/b56"]