Dockerfile

# Multi-stage build for minimal image size
FROM golang:1.24-alpine AS builder

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

WORKDIR /app

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

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

# Build the application
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo \
    -ldflags="-w -s" \
    -o /app/growcast ./cmd/growcast/main.go

# Final stage
FROM alpine:3.21

# Install runtime dependencies (FFmpeg is essential)
RUN apk add --no-cache ffmpeg ca-certificates

# Create non-root user
RUN addgroup -g 1000 growcast && \
    adduser -D -u 1000 -G growcast growcast

WORKDIR /app

# Copy binary and bundled fonts from builder
COPY --from=builder /app/growcast .
COPY fonts/ ./fonts/

# Create config and data directories
RUN mkdir -p /etc/growcast /var/growcast && \
    chown -R growcast:growcast /etc/growcast /var/growcast

# Switch to non-root user
USER growcast

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD wget --no-verbose --tries=1 -O /dev/null http://localhost:8080/health || exit 1

# Expose API port
EXPOSE 8080

# Set environment variables
ENV GROWCAST_LOG_LEVEL=info

# Volume for configuration
VOLUME ["/etc/growcast", "/var/growcast"]

# Run the application
CMD ["./growcast", "-config", "/etc/growcast/config.yaml"]