Docker build refactor (#568)

Dockerfile

@@ -1,17 +1,29 @@
-FROM alpine:3.15
-LABEL maintainer="Dan Sosedoff <dan.sosedoff@gmail.com>"
-ENV PGWEB_VERSION 0.11.11
+# ------------------------------------------------------------------------------
+# Builder Stage
+# ------------------------------------------------------------------------------
+FROM golang:1.18-buster AS build
+
+WORKDIR /build
+ADD . /build
+
+RUN go mod download
+RUN make build
+
+# ------------------------------------------------------------------------------
+# Release Stage
+# ------------------------------------------------------------------------------
+FROM debian:buster-slim
 
 RUN \
-  apk update && \
-  apk add --no-cache ca-certificates openssl postgresql wget && \
+  apt-get update && \
+  apt-get install -y ca-certificates openssl postgresql && \
   update-ca-certificates && \
-  rm -rf /var/cache/apk/* && \
-  cd /tmp && \
-  wget -q https://github.com/sosedoff/pgweb/releases/download/v$PGWEB_VERSION/pgweb_linux_amd64.zip && \
-  unzip pgweb_linux_amd64.zip -d /usr/bin && \
-  mv /usr/bin/pgweb_linux_amd64 /usr/bin/pgweb && \
-  rm -f pgweb_linux_amd64.zip
+  apt-get clean autoclean && \
+  apt-get autoremove --yes && \
+  rm -rf /var/lib/{apt,dpkg,cache,log}/
+
+COPY --from=build /build/pgweb /usr/bin/pgweb
 
 EXPOSE 8081
+
 CMD ["/usr/bin/pgweb", "--bind=0.0.0.0", "--listen=8081"]