Allow to disable SSL certificate verification in CLI (#21)

* Allow to disable SSL certificate verification in package upload

* Add global option

* Implement JJ's comments

* Fix pre-commit

src/quetz_client/cli.py

@@ -1,11 +1,14 @@
 import os
+from typing import Optional
 
 import fire
 
 from quetz_client.client import QuetzClient
 
 
-def get_client(*, url=None, token=None) -> QuetzClient:
+def get_client(
+    *, url: Optional[str] = None, token: Optional[str] = None, insecure: bool = False
+) -> QuetzClient:
     """
     CLI tool to interact with a Quetz server.
 
@@ -18,10 +21,14 @@ def get_client(*, url=None, token=None) -> QuetzClient:
     token: Optional[str]
         The API key needed to authenticate with the server.
         Defaults to the `QUETZ_API_KEY` environment variable.
+
+    insecure: bool
+        Allow quetz-client to perform "insecure" SSL connections.
     """
-    url = url or os.environ.get("QUETZ_SERVER_URL")
-    token = token or os.environ.get("QUETZ_API_KEY")
+    url = url or os.environ["QUETZ_SERVER_URL"]
+    token = token or os.environ["QUETZ_API_KEY"]
     client = QuetzClient.from_token(url, token)
+    client.session.verify = not insecure
     return client