try same OS for build/run images, per feedback

https://lobste.rs/s/dzaeid/go_http_server_project_template#c_vs0btd

Dockerfile

@@ -8,7 +8,7 @@ RUN golangci-lint run
 
 ## build image:
 #ARG GO_VERSION=1.15
-FROM golang:1.15-alpine AS builder
+FROM golang:1.15-buster AS builder
 
 RUN mkdir /user && \
     echo 'nobody:x:65534:65534:nobody:/:' > /user/passwd && \
@@ -32,7 +32,7 @@ RUN go mod vendor
 RUN tar -c . | bzip2 > /src.tbz2
 
 ## output image:
-FROM ubuntu:focal AS final
+FROM debian:buster-slim AS final
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /build/httpd /app/httpd
 COPY --from=builder /src.tbz2 /usr/local/src/src.tbz2