Dockerfile

FROM golang:alpine AS builder

# Git is required for fetching the dependencies.
# Ca-certificates is required to call HTTPS endpoints.
RUN apk update && apk add --no-cache git ca-certificates && update-ca-certificates

# Create appuser
ENV USER=appuser
ENV UID=10001

# See https://stackoverflow.com/a/55757473/12429735RUN 
RUN adduser \    
    --disabled-password \    
    --gecos "" \    
    --home "/nonexistent" \    
    --shell "/sbin/nologin" \    
    --no-create-home \    
    --uid "${UID}" \    
    "${USER}"

WORKDIR $GOPATH/src/github.com/ipfs-shipyard/ipfs-counter/

COPY . .
RUN go mod download
RUN go mod verify

RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags="-w -s" -o /go/bin/ipfs-counter

# STEP 2 build a small image
FROM scratch

COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group

COPY --from=builder /go/bin/ipfs-counter /go/bin/ipfs-counter

USER appuser:appuser

ENTRYPOINT ["/go/bin/ipfs-counter"]