ci: do not run 3.6 tests by default (#880)

Copied from GoogleCloudPlatform/python-docs-samples#7409

Co-authored-by: Anna Cocuzzo <63511057+acocuzzo@users.noreply.github.com>

samples/snippets/noxfile_config.py

@@ -1,4 +1,4 @@
-# Copyright 2020 Google LLC
+# Copyright 2021 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -14,15 +14,15 @@
 
 # Default TEST_CONFIG_OVERRIDE for python repos.
 
-# You can copy this file into your directory, then it will be inported from
+# You can copy this file into your directory, then it will be imported from
 # the noxfile.py.
 
 # The source of truth:
-# https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/noxfile_config.py
+# https://github.com/GoogleCloudPlatform/python-docs-samples/blob/main/noxfile_config.py
 
 TEST_CONFIG_OVERRIDE = {
     # You can opt out from the test for specific Python versions.
-    "ignored_versions": ["2.7"],
+    "ignored_versions": ["2.7", "3.6"],
     # Old samples are opted out of enforcing Python type hints
     # All new samples should feature them
     "enforce_type_hints": True,
@@ -32,6 +32,10 @@
     # to use your own Cloud project.
     "gcloud_project_env": "GOOGLE_CLOUD_PROJECT",
     # 'gcloud_project_env': 'BUILD_SPECIFIC_GCLOUD_PROJECT',
+    # If you need to use a specific version of pip,
+    # change pip_version_override to the string representation
+    # of the version number, for example, "20.2.4"
+    "pip_version_override": None,
     # A dictionary you want to inject into your test. Don't put any
     # secrets here. These values will override predefined values.
     "envs": {},