chore: fix os

Author: eliasscosta

Dockerfile

@@ -3,6 +3,7 @@ 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
+ENV GOARCH=amd64
 RUN make release
 RUN chmod +x postgres_exporter && mv postgres_exporter /tmp/postgres_exporter
 

Makefile

@@ -14,4 +14,4 @@ GO_BUILD_LDFLAGS = -X github.com/prometheus/common/version.Version=$(shell cat V
 export PMM_RELEASE_PATH?=.
 
 release:
-	go build -ldflags="$(GO_BUILD_LDFLAGS)" -o $(PMM_RELEASE_PATH)/postgres_exporter ./cmd/postgres_exporter
+	GOOS=linux go build -ldflags="$(GO_BUILD_LDFLAGS)" -o $(PMM_RELEASE_PATH)/postgres_exporter ./cmd/postgres_exporter