Removed usage of PyYAML for config parsing. (#13883)

* Ignore entire __pycache__ folder instead of individual *.pyc files

* Ignore .mypy_cache in git

* Rework config YAML parsing to use only ruamel.yaml

PyYAML silently overrides keys when encountering duplicates, but ruamel
raises and exception by default. Since we're already using it elsewhere,
dropping PyYAML is an easy choice to make.

* Added EnvString in config to slim down runtime_config()

* Added gitlens to devcontainer

* Automatically call FrigateConfig.runtime_config()

runtime_config needed to be called manually before. Now, it's been
removed, but the same code is run by a pydantic validator.

* Fix handling of missing -segment_time

* Removed type annotation on FrigateConfig's parse

I'd like to keep them, but then mypy complains about some fundamental
errors with how the pydantic model is structured. I'd like to fix it,
but I'd rather work towards moving some of this config to the database.

frigate/util/builtin.py

@@ -9,14 +9,12 @@ import queue
 import re
 import shlex
 import urllib.parse
-from collections import Counter
 from collections.abc import Mapping
 from pathlib import Path
 from typing import Any, Optional, Tuple
 
 import numpy as np
 import pytz
-import yaml
 from ruamel.yaml import YAML
 from tzlocal import get_localzone
 from zoneinfo import ZoneInfoNotFoundError
@@ -89,34 +87,6 @@ def deep_merge(dct1: dict, dct2: dict, override=False, merge_lists=False) -> dic
     return merged
 
 
-def load_config_with_no_duplicates(raw_config) -> dict:
-    """Get config ensuring duplicate keys are not allowed."""
-
-    # https://stackoverflow.com/a/71751051
-    # important to use SafeLoader here to avoid RCE
-    class PreserveDuplicatesLoader(yaml.loader.SafeLoader):
-        pass
-
-    def map_constructor(loader, node, deep=False):
-        keys = [loader.construct_object(node, deep=deep) for node, _ in node.value]
-        vals = [loader.construct_object(node, deep=deep) for _, node in node.value]
-        key_count = Counter(keys)
-        data = {}
-        for key, val in zip(keys, vals):
-            if key_count[key] > 1:
-                raise ValueError(
-                    f"Config input {key} is defined multiple times for the same field, this is not allowed."
-                )
-            else:
-                data[key] = val
-        return data
-
-    PreserveDuplicatesLoader.add_constructor(
-        yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG, map_constructor
-    )
-    return yaml.load(raw_config, PreserveDuplicatesLoader)
-
-
 def clean_camera_user_pass(line: str) -> str:
     """Removes user and password from line."""
     rtsp_cleaned = re.sub(REGEX_RTSP_CAMERA_USER_PASS, "://*:*@", line)