Dockerfile

# Stage 1: Build the application
FROM golang:1.22-alpine AS builder

WORKDIR /app

# Copy go.mod and go.sum to download dependencies first
COPY go.mod go.sum ./
RUN go mod download

# Copy the rest of the source code
COPY . .

# Build the application, statically linking it
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o /m3s-server ./cmd/server

# Stage 2: Create the final, minimal image
FROM alpine:latest

WORKDIR /app

# Copy the compiled binary from the builder stage
COPY --from=builder /m3s-server .

# Copy the configuration directory
COPY configs/ ./configs/

# Expose the default port the application runs on
EXPOSE 18061

# The .env file should be provided at runtime, e.g., via a volume or config map
# ENTRYPOINT ["/app/m3s-server"]
CMD ["/app/m3s-server"]