General updates for flows

-  add docker file to build a container with
   additional flow-nodes
-  instructions for build and usage of flows

Issue-ID: OAM-333
Change-Id: Ie43cc3d23c95d14cbd900c9e4233b3ea57a1332d
Signed-off-by: Martin Skorupski <martin.skorupski@highstreet-technologies.com>
diff --git a/solution/smo/apps/flows/Dockerfile b/solution/smo/apps/flows/Dockerfile
new file mode 100644
index 0000000..7716597
--- /dev/null
+++ b/solution/smo/apps/flows/Dockerfile
@@ -0,0 +1,26 @@
+################################################################################
+# Copyright 2023 highstreet technologies GmbH
+#
+# 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.
+
+# inspired by https://nodered.org/docs/getting-started/docker
+
+ARG BASEIMAGE=nodered/node-red:latest
+FROM ${BASEIMAGE}
+
+# Copy package.json to the WORKDIR so npm builds all
+# of your added nodes modules for Node-RED
+WORKDIR /data
+COPY ./data/package.json .
+RUN npm install --unsafe-perm --no-update-notifier --no-fund --only=production
+WORKDIR /usr/src/node-red
\ No newline at end of file