Dockerfile for python, ruby, and C# template should not use ROOT

Signed-off-by: Eric Stoekl <ems5311@gmail.com>

template/csharp/Dockerfile

@@ -2,8 +2,9 @@ FROM microsoft/dotnet:2.0-sdk as builder
 
 ENV DOTNET_CLI_TELEMETRY_OPTOUT 1
 
-WORKDIR /root/
-WORKDIR /root/src
+RUN mkdir -p /home/app/src
+WORKDIR /home/app/src
+
 COPY .  .
 RUN dotnet restore ./root.csproj
 RUN dotnet publish -c release -o published
@@ -20,8 +21,12 @@ RUN apt-get update -qy \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
-WORKDIR /root/
-COPY --from=builder /root/src/published .
+WORKDIR /home/app/
+COPY --from=builder /home/app/src/published .
+
+RUN useradd app
+RUN chown -R app ./
+USER app
 
 ENV fprocess="dotnet ./root.dll"
 EXPOSE 8080

template/python/Dockerfile

@@ -9,19 +9,27 @@ RUN apk --no-cache add curl \
 
 WORKDIR /root/
 
-COPY index.py           .
-COPY requirements.txt   .
+RUN mkdir -p /home/app/function
+
+COPY index.py           /home/app
+COPY requirements.txt   /home/app
+
+WORKDIR /home/app
 RUN pip install -r requirements.txt
 
 COPY function           function
 
 RUN touch ./function/__init__.py
 
-WORKDIR /root/function/
+WORKDIR /home/app/function/
 COPY function/requirements.txt	.
 RUN pip install -r requirements.txt
 
-WORKDIR /root/
+WORKDIR /home/app
+
+RUN adduser app -D
+RUN chown -R app ./
+USER app
 
 ENV fprocess="python index.py"
 

template/ruby/Dockerfile

@@ -8,16 +8,23 @@ RUN apk --no-cache add curl \
     && apk del curl --no-cache
 
 WORKDIR /root/
+RUN mkdir -p /home/app/
+WORKDIR /home/app/
 
 COPY Gemfile		.
 COPY index.rb           .
 COPY function           function
 RUN bundle install 
 
-WORKDIR /root/function/
+WORKDIR /home/app/function/
 RUN bundle install 
 
-WORKDIR /root/
+WORKDIR /home/app/
+
+RUN adduser app -D
+RUN chown -R app ./
+USER app
+
 ENV fprocess="ruby index.rb"
 HEALTHCHECK --interval=2s CMD [ -e /tmp/.lock ] || exit 1