app/templates/docker/dockerfile_go.j2

{% if config.multiStage %}
# Multi-stage build for Go
FROM golang:{{ config.goVersion or '1.21' }}-alpine AS builder

WORKDIR /app

# Install git for go mod download
RUN apk add --no-cache git

# Copy go mod files
COPY go.mod go.sum* ./

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

# Build application with static linking and optimizations
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags="-w -s" -o main {{ config.mainPackage or '.' }}

# Production stage - minimal image
FROM alpine:latest

# Install ca-certificates for HTTPS
RUN apk --no-cache add ca-certificates

WORKDIR /root/

# Copy binary from builder
COPY --from=builder /app/main .

{% else %}
# Go {{ config.goVersion or '1.21' }} Dockerfile
FROM golang:{{ config.goVersion or '1.21' }}-alpine

WORKDIR /app

# Install build dependencies
RUN apk add --no-cache git

# Copy go mod files
COPY go.mod go.sum* ./

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

{% if not config.developmentMode %}
# Build application
RUN go build -o main {{ config.mainPackage or '.' }}
{% endif %}
{% endif %}

# Expose port
EXPOSE {{ config.port or '8080' }}

# Create non-root user
RUN addgroup -g 1001 -S golang && \
    adduser -S golang -u 1001 && \
    chown -R golang:golang /root/

USER golang

{% if config.developmentMode %}
# Development mode with hot-reload
RUN go install github.com/cosmtrek/air@latest

CMD ["air", "-c", ".air.toml"]
{% else %}
# Production mode
CMD ["./main"]
{% endif %}