build: expose port in app-only dockerfile

Dockerfile.Executable

@@ -0,0 +1,20 @@
+# Creates a docker image with only the app as an executable unit
+# Dependencies need to be installed beforehand
+# Needs to be build beforehand
+# docker build -t registry.gitlab.com/openstapps/app/executable:core-x.y -f Dockerfile.Executable .
+FROM node:10-alpine
+
+WORKDIR /app
+COPY . /app
+
+# To use ng directly
+ENV PATH /app/node_modules/.bin:$PATH
+
+EXPOSE 8100
+
+# Because the dependencies were installed from the builder-Image,
+# or locally, we need to rebuild node-sass library
+RUN npm rebuild node-sass
+
+# Starts the app
+CMD ng run app:serve --host=0.0.0.0 --port=8100