Remove trailing slash from bucket_host

The `fastenv.cloud.object_storage.ObjectStorageConfig` class is used to
configure fastenv for connecting to object storage buckets. The class
accepts a `bucket_host` in "virtual-hosted-style," like
`<BUCKET_NAME>.s3.<REGION>.amazonaws.com` for AWS S3 or
`<BUCKET_NAME>.s3.<REGION>.backblazeb2.com` for Backblaze B2.

It is common to append trailing slashes ("/") to URLs. These should be
removed during configuration because some of the configuration logic
uses the Python string method `string.endswith()` assuming there is no
slash at the end.

This commit will update
`fastenv.cloud.object_storage.ObjectStorageConfig`
to remove trailing slashes from `bucket_host`.

#8
https://docs.aws.amazon.com/AmazonS3/latest/userguide/VirtualHosting.html

fastenv/cloud/object_storage.py

@@ -77,6 +77,7 @@ def __init__(
                 "`<BUCKET_NAME>.s3.<REGION>.backblazeb2.com` for Backblaze B2."
             )
         elif bucket_host and not bucket_name:
+            bucket_host = bucket_host.rstrip("/")
             scheme = (
                 "http://"
                 if bucket_host.startswith("http://")

tests/cloud/test_object_storage.py

@@ -314,6 +314,22 @@ def test_config_if_scheme_in_bucket_host(
         assert self.config_is_correct(config, expected_bucket_host=expected_bucket_host)
         assert scheme not in config.bucket_host
 
+    def test_config_if_trailing_slash_in_bucket_host(
+        self, mocker: MockerFixture
+    ) -> None:
+        """Assert that trailing slash ("/") is removed."""
+        mocker.patch.dict(os.environ, clear=True)
+        bucket_host = f"{self.example_bucket_host}/"
+        expected_bucket_host = self.example_bucket_host
+        config = fastenv.cloud.object_storage.ObjectStorageConfig(
+            access_key=self.example_access_key,
+            secret_key=self.example_secret_key,
+            bucket_host=bucket_host,
+            bucket_region=self.example_bucket_region,
+        )
+        assert self.config_is_correct(config, expected_bucket_host=expected_bucket_host)
+        assert not config.bucket_host.endswith("/")
+
 
 class TestObjectStorageClientUnit:
     """Test `class ObjectStorageClient` and its methods.