Dockerfile

ARG GO_VERSION=1.22
ARG ALPINE_VERSION=3.18

FROM golang:${GO_VERSION} as builder 

WORKDIR /app

RUN --mount=type=cache,target=/go/pkg/mod/ \
    --mount=type=bind,source=go.sum,target=go.sum \
    --mount=type=bind,source=go.mod,target=go.mod \
    go mod download -x

RUN mkdir -p /out/build

RUN --mount=type=cache,target=/go/pkg/mod/ \
    --mount=type=bind,target=. \
    CGO_ENABLED=0 GOOS=linux go build -o /out/build/main ./cmd/api/.

FROM alpine:${ALPINE_VERSION} AS prod

WORKDIR /app

RUN --mount=type=cache,target=/var/cache/apk \
    apk --update add \
    ca-certificates \
    tzdata \
    && \
    update-ca-certificates

ARG UID=10001

RUN adduser \
    --disabled-password \
    --gecos "" \
    --home "/nonexistent" \
    --shell "/sbin/nologin" \
    --no-create-home \
    --uid "${UID}" \
    appuser

USER appuser

COPY --from=builder /out/build/main .

EXPOSE 8080 

CMD ["./main"]