Setup FOSSA as part of CI (#7999)

* Setup FOSSA as part of CI

* Add comments and links to FOSSA docs on script

scripts/fossa.sh

@@ -0,0 +1,26 @@
+#!/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.
+#
+
+# This is the recommended way to install FOSSA's cli per the docs:
+# https://docs.fossa.com/docs/travisci#section-add-fossa-steps-to-travisyml
+curl -H 'Cache-Control: no-cache' https://raw.githubusercontent.com/fossas/fossa-cli/master/install.sh | sudo bash
+
+# This key is a push-only API key, also recommended for public projects
+# https://docs.fossa.com/docs/api-reference#section-push-only-api-token
+FOSSA_API_KEY="f72e93645bdfeab94bd227c7bbdda4ef" fossa