feat: downloader

Dockerfile

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+# Build stage
+FROM golang:1.24.4-alpine AS builder
+
+# Install build dependencies
+RUN apk add --no-cache git ca-certificates tzdata
+
+# 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
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
+    -ldflags="-w -s" \
+    -o predictor \
+    ./cmd/api
+
+# Runtime stage
+FROM alpine:3.19
+
+# Install runtime dependencies
+RUN apk add --no-cache ca-certificates tzdata
+
+# Create non-root user
+RUN addgroup -g 1001 -S appgroup && \
+    adduser -u 1001 -S appuser -G appgroup
+
+# Set working directory
+WORKDIR /app
+
+# Copy binary from builder stage
+COPY --from=builder /app/predictor .
+
+# Create necessary directories
+RUN mkdir -p /tmp/grib && \
+    chown -R appuser:appgroup /app /tmp/grib
+
+# Switch to non-root user
+USER appuser
+
+# Expose port
+EXPOSE 8080
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1
+
+# Run the application
+CMD ["./predictor"]