Allow relative path in unix socket URLs

Close #123

Signed-off-by: Salvatore Mesoraca <salvatore.mesoraca@aiven.io>

valkey/_parsers/url_parser.py

@@ -40,10 +40,11 @@ def parse_url(url: str, async_connection: bool):
     supported_schemes = ["valkey", "valkeys", "redis", "rediss", "unix"]
     parsed: ParseResult = urlparse(url)
     kwargs: ConnectKwargs = {}
+    lower_url = url.lower()
     pattern = re.compile(
-        r"^(?:" + "|".join(map(re.escape, supported_schemes)) + r")://", re.IGNORECASE
+        r"^(?:" + "|".join(map(re.escape, supported_schemes)) + r")://"
     )
-    if not pattern.match(url):
+    if not pattern.match(lower_url) and not lower_url.startswith("unix:"):
         raise ValueError(
             f"Valkey URL must specify one of the following schemes {supported_schemes}"
         )