Add CHANGELOG.md to document Debian 13 compatibility updates

Co-authored-by: ShaYmez <76499782+ShaYmez@users.noreply.github.com>

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Changed
+- Updated Dockerfile base image from Alpine 3.18 to Alpine 3.20 for better compatibility with modern systems
+- Updated GitHub Actions workflow to use current versions (checkout@v4, docker/setup-buildx-action@v3, docker/login-action@v3)
+- Modernized docker-compose.yml by removing obsolete version field
+- Updated Python dependency minimum versions for Debian 13 and Python 3.11/3.12 compatibility:
+  - bitstring: 3.1.9 → 4.0.0
+  - bitarray: 2.3.5 → 2.8.0
+  - Twisted: 21.7.0 → 24.0.0
+  - configparser: 5.2.0 → 7.0.0
+
+### Fixed
+- Fixed POSIX compliance in entrypoint script (changed `==` to `=` for shell comparison)
+- Added error handling to `cd` command in entrypoint script
+
+### Security
+- Updated all GitHub Actions to latest versions for improved security
+- Verified no security vulnerabilities in updated dependencies
+
+## [1.6.10] - Previous Release
+
+### Note
+- This changelog was added as part of Debian 13 compatibility updates
+- For changes prior to this version, please refer to git commit history