Simplify build process (drop docker and cross-compilation)

Dockerfile

@@ -1,20 +0,0 @@
-FROM golang:alpine as build
-
-WORKDIR /root
-COPY . /root
-RUN go install golang.org/x/tools/cmd/stringer@latest && go generate ./... && go build .
-
-FROM alpine:latest
-
-ENV LISTEN_ADDRESS="0.0.0.0" LISTEN_PORT="9452"
-
-RUN addgroup -S mystrom \
-    && adduser -S mystrom -G mystrom \
-    && mkdir /app \
-    && chown -R mystrom:mystrom /app
-
-WORKDIR /app
-USER mystrom
-COPY --from=build /root/mystrom-exporter /app
-
-CMD /app/mystrom-exporter -web.listen-address $LISTEN_ADDRESS:$LISTEN_PORT

Makefile

@@ -21,36 +21,28 @@ LDFLAGS   := -w -s \
 	-X $(versionPkgPrefix).BuildUser=${builduser} \
 	-X $(versionPkgPrefix).BuildDate=${builddate}
 GOFLAGS   := -v
-GOX_FLAGS          := -mod=vendor
 GO_BUILD_FLAGS     := -v
 export GO111MODULE := on
 
-build: go-tools generate ## builds the all platform binaries of the exporter
-	$(GOPATH)/bin/gox \
-			-os="darwin linux" \
-			-arch="amd64 arm arm64" \
-			-osarch="!darwin/arm" \
-			-output "${BINDIR}/{{.Dir}}-{{.OS}}-{{.Arch}}" \
-			-gcflags "$(GO_BUILD_FLAGS)" \
-			-ldflags '$(LDFLAGS)' \
-			-tags '$(TAGS)' \
-			./...
+build: go-tools generate ## build mystrom-exporter for your local system
+	$(GO) build \
+		-o ${BINDIR}/mystrom-exporter \
+		-gcflags "$(GO_BUILD_FLAGS)" \
+		-ldflags '$(LDFLAGS)' \
+		-tags '$(TAGS)' \
+		.
 
 run:
-	${BINDIR}/mystrom-exporter-$(shell $(GO) env GOOS)-$(shell $(GO) env GOARCH)
-
+	${BINDIR}/mystrom-exporter
 
 generate: go-tools
 	$(GO) generate ./...
 
-go-tools: $(GOPATH)/bin/stringer $(GOPATH)/bin/gox
+go-tools: $(GOPATH)/bin/stringer
 
 # -- see more info on https://pkg.go.dev/golang.org/x/tools/cmd/stringer
 $(GOPATH)/bin/stringer:
 	$(GO) install golang.org/x/tools/cmd/stringer@latest
 
-$(GOPATH)/bin/gox:
-	$(GO) install github.com/mitchellh/gox@latest
-# --
 help:
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST)  | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'