Add version and hash to docker container (#167)

* Add version and git hash to image
* Add version reporting to HA via api

linux_voice_assistant/util.py

@@ -4,8 +4,68 @@ import uuid
 # netifaces lib is from netifaces2
 import netifaces
 from collections.abc import Callable
+from importlib.metadata import version, PackageNotFoundError
+from pathlib import Path
 from typing import Optional
 
+# Cache for version to avoid repeated file reading
+_version_cache: Optional[str] = None
+_esphome_version_cache: Optional[str] = None
+
+
+def get_version() -> str:
+    """
+    Read the version from version.txt file.
+    
+    This function reads the content safely without risk of code injection,
+    as it only reads raw text and performs no evaluation.
+    
+    Returns:
+        str: The version from version.txt or 'unknown' if the file
+             does not exist or cannot be read.
+    """
+    global _version_cache
+    
+    if _version_cache is not None:
+        return _version_cache
+    
+    version_file = Path(__file__).parent.parent / "version.txt"
+    
+    try:
+        # Sicher lesen: nur Rohtext, keine Evaluierung
+        version = version_file.read_text(encoding="utf-8").strip()
+        _version_cache = version if version else "unknown"
+    except (FileNotFoundError, PermissionError, OSError):
+        _version_cache = "unknown"
+    
+    return _version_cache
+
+
+def get_esphome_version() -> str:
+    """
+    Read the version of the installed aioesphomeapi package.
+    
+    This function uses importlib.metadata to safely retrieve the version
+    of an installed Python package without executing any code from the
+    package itself.
+    
+    Returns:
+        str: The version of aioesphomeapi (e.g., '42.7.0'), or 'unknown'
+             if the package is not installed or the version cannot be read.
+    """
+    global _esphome_version_cache
+    
+    if _esphome_version_cache is not None:
+        return _esphome_version_cache
+    
+    try:
+        _esphome_version_cache = version("aioesphomeapi")
+    except PackageNotFoundError:
+        _esphome_version_cache = "unknown"
+    
+    return _esphome_version_cache
+
+
 def call_all(*callables: Optional[Callable[[], None]]) -> None:
     for item in filter(None, callables):
         item()