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Dockerfile

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+# Multi-stage build for SubConverter-Go
+# ======================================
+
+# Stage 1: Build stage
+FROM golang:1.21-alpine AS builder
+
+# Install build dependencies
+RUN apk add --no-cache git
+
+# Set working directory
+WORKDIR /app
+
+# Copy go mod files
+COPY go.mod go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the application with ldflags
+RUN CGO_ENABLED=0 GOOS=linux go build \
+    -ldflags="-w -s -X 'main.Version=1.0.0' -X 'main.BuildTime=$(date -u '+%Y-%m-%d %H:%M:%S')'" \
+    -a -installsuffix cgo \
+    -o subconverter-go main.go
+
+# Stage 2: Runtime stage
+FROM alpine:latest
+
+# Install ca-certificates for HTTPS
+RUN apk --no-cache add ca-certificates tzdata
+
+# Create non-root user
+RUN addgroup -g 1001 -S appgroup && \
+    adduser -u 1001 -S appuser -G appgroup
+
+# Create directories
+RUN mkdir -p /app/logs /app/config && \
+    chown -R appuser:appgroup /app
+
+# Set working directory
+WORKDIR /app
+
+# Copy binary from builder
+COPY --from=builder /app/subconverter-go .
+
+# Copy config file template
+COPY config.yaml.example ./config.yaml.example
+
+# Switch to non-root user
+USER appuser
+
+# Expose port
+EXPOSE 25500
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:25500/health || exit 1
+
+# Run the application
+CMD ["./subconverter-go", "--config", "/app/config.yaml"]