Dockerfile

# syntax=docker/dockerfile:1.7

# --- Build stage ---
FROM golang:1.25.5-bookworm AS builder
ENV GOPROXY=https://goproxy.io,direct
ENV GOSUMDB=sum.golang.org
WORKDIR /src

# Enable Go modules and download deps first for better caching
COPY go.mod go.sum ./
RUN go mod download

# Copy the rest of the source
COPY . .

# Build the API binary
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /out/sms-gateway ./cmd/api

# --- Runtime stage ---
FROM alpine:edge AS runner
WORKDIR /app

# Copy binary and required runtime assets (DB schema for migrations)
COPY --from=builder /out/sms-gateway /usr/local/bin/sms-gateway
COPY db/db.sql db/db.sql

EXPOSE 8080
ENTRYPOINT ["/usr/local/bin/sms-gateway"]