Add Mynewt target builds to CI

Adds scripts to build and test many Mynewt project configurations; this
avoids breaking builds after changes are not tested for some particular
configuration option.

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/ci/mynewt_run.sh b/ci/mynewt_run.sh
new file mode 100755
index 0000000..f944f62
--- /dev/null
+++ b/ci/mynewt_run.sh
@@ -0,0 +1,31 @@
+#!/bin/bash -x
+
+# 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.
+
+export PATH=$HOME/bin:$PATH
+pwd
+
+ln -s ci/mynewt_targets targets
+ln -s ci/mynewt_keys keys
+
+for target in $(ls targets); do
+    newt build $target
+    [[ $? -ne 0 ]] && exit 1
+done
+
+exit 0