Initial implementation of proxy auth header

.flake8

@@ -0,0 +1,7 @@
+[flake8]
+exclude = .git,__pycache__,data,old,build,dist
+max-complexity = 10
+max-line-length = 88
+extend-ignore = E203
+per-file-ignores =
+    */__init__.py: F401

mlflow_plugin_proxy_auth/proxy_auth_header_provider.py

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+import base64
+import os
+
+from mlflow.tracking.request_auth.abstract_request_auth_provider import (
+    RequestAuthProvider,
+)
+
+
+class ProxyAuthProvider(RequestAuthProvider):
+    def __init__(self):
+        self.username = os.getenv("MLFLOW_TRACKING_USERNAME")
+        self.password = os.getenv("MLFLOW_TRACKING_PASSWORD")
+
+    def get_name(self):
+        return "proxy_auth_provider"
+
+    def get_auth(self):
+        # Add your Authelia Proxy-Authorization logic here
+        credentials = f"{self.username}:{self.password}"
+        encoded_credentials = base64.b64encode(credentials.encode("utf-8")).decode(
+            "utf-8"
+        )
+        proxy_authorization_header = f"Basic {encoded_credentials}"
+
+        # Return a dictionary containing the header for authentication
+        return {"Proxy-Authorization": proxy_authorization_header}

setup.py

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+from setuptools import find_packages, setup
+
+setup(
+    name="mlflow-plugin-proxy-auth",
+    version="0.0.1",
+    packages=find_packages(),
+    install_requires=["mlflow"],
+    entry_points={
+        "mlflow.request_auth_provider": "dummy-backend=mlflow_plugin_proxy_auth.proxy_auth_header_provider:ProxyAuthProvider",
+    },
+)