# syntax=docker/dockerfile:1

# ---- build stage ----
FROM golang:1.27-alpine AS build
WORKDIR /src

# cache deps first
COPY go.mod go.sum ./
RUN go mod download

COPY . .
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o /palette .

# ---- runtime stage ----
FROM alpine:3.20

# non-root user
RUN adduser -D -u 10001 palette

COPY --from=build /palette /usr/local/bin/palette

USER palette
WORKDIR /data

ENV PALETTE_ADDR=":8080" \
    PALETTE_DB="/data/palette.db"

EXPOSE 8080
VOLUME /data

HEALTHCHECK --interval=30s --timeout=3s --retries=3 \
  CMD wget -qO- http://127.0.0.1:8080/ >/dev/null 2>&1 || exit 1

ENTRYPOINT ["palette"]