FROM --platform=$BUILDPLATFORM golang:1.23-alpine AS build
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
ARG TARGETOS=linux
ARG TARGETARCH=amd64
RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -o /out/gsg .

FROM alpine:3.20
RUN apk add --no-cache git gnupg
COPY --from=build /out/gsg /usr/local/bin/gsg

EXPOSE 8080
ENTRYPOINT ["gsg"]
CMD ["-root", "/srv/git", "-addr", ":8080"]