chore: build inside dockerfile

Author: eliasscosta

Dockerfile

@@ -1,11 +1,15 @@
-ARG ARCH="amd64"
-ARG OS="linux"
-FROM quay.io/prometheus/busybox-${OS}-${ARCH}:latest
+
+FROM golang:1.19-alpine as build
+WORKDIR ${GOPATH}/src/github.com/quintoandar
+RUN apk update && apk add make git curl && git clone --branch main https://github.com/quintoandar/postgres_exporter.git
+WORKDIR ${GOPATH}/src/github.com/quintoandar/postgres_exporter
+RUN make release
+RUN chmod +x postgres_exporter && mv postgres_exporter /tmp/postgres_exporter
+
+FROM quay.io/prometheus/busybox:latest as final
 LABEL maintainer="The Prometheus Authors <prometheus-developers@googlegroups.com>"
 
-ARG ARCH="amd64"
-ARG OS="linux"
-COPY .build/${OS}-${ARCH}/postgres_exporter /bin/postgres_exporter
+COPY --from=build ["/tmp/postgres_exporter", "/bin/postgres_exporter" ]
 
 EXPOSE     9187
 USER       nobody