my file learn about tech container (docker, podman, kubernetes)
FROM golang:1.18-alpine as builder
FROM alpine:3
COPY --from=builder /app/main ./
FROM golang:1.18-alpine as builder
WORKDIR /app
COPY main.go /app
RUN go build -o /app/main main.go
FROM alpine:3
WORKDIR /app
COPY --from=builder /app/main ./
CMD /app/main