Dockerfile

# ---------------------------------------------
# Build Stage: compile Go binary with static SQLite
# ---------------------------------------------
    FROM golang:1.24-alpine AS builder

    ENV CGO_ENABLED=1
    
    RUN apk add --no-cache \
        gcc \
        musl-dev \
        sqlite
    
    WORKDIR /workspace
    
    COPY go.mod go.sum ./
    RUN go mod download
    
    COPY cmd    ./cmd
    COPY internal ./internal
    COPY assets ./assets
    COPY pkg ./pkg
    
    # Build a static, stripped binary
    RUN go build \
        -ldflags "-s -w -extldflags '-static'" \
        -o forum ./cmd/web
    
    # initialize a fresh DB on the builder
    COPY data/init.sql          /workspace/init.sql
    RUN sqlite3 data.db < ./init.sql && \
    sqlite3 data.db ".tables"
    
    # ---------------------------------------------
    # Runtime Stage: minimal scratch image
    # ---------------------------------------------
        FROM scratch
        COPY --from=builder /workspace/forum /usr/local/bin/forum
        COPY --from=builder /workspace/data.db    /app/data/db.sqlite

        WORKDIR /app
        
        # Tell Docker this is where the DB lives
        VOLUME ["/app/data"]
        ENV DATABASE_PATH="/app/data/db.sqlite"
        
        EXPOSE 4001
        ENTRYPOINT ["/usr/local/bin/forum"]