feat(analyzer): override paths using env variables

Allow overriding FFMPEG, FFPROBE, or LIQUIDSOAP paths using env variables.

analyzer/libretime_analyzer/pipeline/analyze_playability.py

@@ -5,14 +5,13 @@ from typing import Any, Dict
 
 from loguru import logger
 
+from ._liquidsoap import LIQUIDSOAP
+
 
 class UnplayableFileError(Exception):
     pass
 
 
-LIQUIDSOAP_EXECUTABLE = "liquidsoap"
-
-
 def analyze_playability(filename: str, metadata: Dict[str, Any]):
     """Checks if a file can be played by Liquidsoap.
     :param filename: The full path to the file to analyzer
@@ -20,7 +19,7 @@ def analyze_playability(filename: str, metadata: Dict[str, Any]):
     :return: The metadata dictionary
     """
     command = [
-        LIQUIDSOAP_EXECUTABLE,
+        LIQUIDSOAP,
         "-v",
         "-c",
         "output.dummy(audio_to_stereo(single(argv(1))))",