# Builder
FROM golang:alpine AS builder

WORKDIR /go/src/app

ARG MAIN_GO=cmd/server/main.go

ARG SERVER_PORT=8080
ENV SERVER_PORT {$SERVER_PORT}

COPY go.mod go.sum ./
COPY internal ./internal
COPY cmd ./cmd

RUN ls -lh

RUN go mod download && \
    CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /go/bin/app $MAIN_GO

# Destination image
FROM gcr.io/distroless/base-debian10

COPY --from=builder /go/bin/app /app

EXPOSE $SERVER_PORT
ENTRYPOINT ["/app"]