Dockerfile.migrate

# syntax=docker/dockerfile:1.7
# Builds the standalone migration runner (cmd/migrate) together with the SQL
# migration files, so `docker compose` can apply migrations before the API starts.
# Migrations are NOT embedded in the binary, so the db/migrations directory is
# copied into the final image alongside the binary.

FROM golang:1.26-alpine AS builder

WORKDIR /src

ENV CGO_ENABLED=0
ENV GOOS=linux
ENV GOARCH=amd64

COPY go.mod go.sum ./
RUN go mod download

COPY . .
RUN go build -trimpath -ldflags="-s -w" -o /out/migrate ./cmd/migrate

FROM alpine:3.20

WORKDIR /app

COPY --from=builder /out/migrate /app/migrate
COPY --from=builder /src/db/migrations /app/db/migrations

# Default command is `up`; override in compose if needed (e.g. `version`, `down`).
ENTRYPOINT ["/app/migrate"]
CMD ["up"]