[Build] Add Github workflows (#9517)

As an replacement to Travis CI.

scripts/python_tests.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+set -e
+
+export SUPERSET_CONFIG=${SUPERSET_CONFIG:-tests.superset_test_config}
+echo "Superset config module: $SUPERSET_CONFIG"
+
+superset db upgrade
+superset init
+nosetests --stop tests/load_examples_test.py
+nosetests --stop --exclude=load_examples_test tests