Docker: Change memory allocator to jemalloc

[wanyvic]

Problem Statement

The current libmdbx implementation uses the default system malloc allocator, which frequently experiences 1-2 second delays during memory allocation operations. This performance bottleneck significantly impacts the overall system performance, especially during high-frequency database operations in the X Layer Erigon node.

Solution Overview

This PR implements jemalloc as the default memory allocator for libmdbx operations by leveraging LD_PRELOAD during Docker build time. This approach allows developers to configure jemalloc behavior through the MALLOC_CONF environment variable without modifying the application code.

Key Changes

Docker Configuration Updates

• Dockerfile.local: Added jemalloc support with LD_PRELOAD configuration
  • Installed jemalloc-dev package in build stage
  • Set CGO_CFLAGS="-I/usr/include/jemalloc" and CGO_LDFLAGS="-ljemalloc"
  • Configured LD_PRELOAD="/usr/lib/libjemalloc.so.2" for runtime
  • Added jemalloc package to runtime stage

Configuration Options

Developers can configure jemalloc behavior using the MALLOC_CONF environment variable:

# Example configurations
export MALLOC_CONF="dirty_decay_ms:1000,muzzy_decay_ms:1000,background_thread:true"
export MALLOC_CONF="stats_print:true,prof:true"  # Enable statistics printing and profiling