Add mint tests into MinIO repo (#7886)

mint/postinstall.sh

@@ -0,0 +1,26 @@
+#!/bin/bash -e
+#
+#  Mint (C) 2017 Minio, Inc.
+#
+#  Licensed 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.
+#
+
+# remove all packages listed in remove-packages.list
+xargs --arg-file=remove-packages.list apt --quiet --yes purge
+apt --quiet --yes autoremove
+
+# remove unwanted files
+rm -fr "$GOROOT" "$GOPATH/src" /var/lib/apt/lists/*
+
+# flush to disk
+sync