sales_backend/Dockerfile

FROM alpine:latest

RUN apk add --no-cache crystal shards openssl openssl-dev musl-dev libc6-compat
COPY . /opt/app/
RUN cd /opt/app && \
    shards

RUN cd /opt/app/ && crystal build --mcpu $(gcc -march=native -Q --help=target|grep march|awk '{print $2}'|head -n 1) --release src/sales_backend.cr

CMD /opt/app/sales_backend