Add Dockerfile for localhost non TLS docker image

Dockerfile

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+#######DEMO APP, DO NOT USE THIS FOR ANYTHING BUT TESTING PURPOSES, ITS NOT MEANT FOR PRODUCTION######
+
+FROM golang:1.17.5-alpine3.15
+
+# Install and download deps.
+RUN apk add --no-cache git curl python2
+RUN git clone https://github.com/webrtc/apprtc.git
+
+# AppRTC GAE setup
+
+# Required to run GAE dev_appserver.py.
+RUN curl https://dl.google.com/dl/cloudsdk/channels/rapid/downloads/google-cloud-sdk-367.0.0-linux-x86_64.tar.gz --output gcloud.tar.gz
+RUN tar -xf gcloud.tar.gz
+RUN google-cloud-sdk/bin/gcloud components install app-engine-python-extras app-engine-python cloud-datastore-emulator --quiet
+
+# Mimick build step by manually copying everything into the appropriate folder and run build script.
+WORKDIR apprtc
+RUN python build/build_app_engine_package.py src/ out/
+RUN curl https://webrtc.github.io/adapter/adapter-latest.js --output src/web_app/js/adapter.js
+RUN cp src/web_app/js/*.js out/js/
+
+# Wrap AppRTC GAE app in a bash script due to needing to run two apps within one container.
+# Make sure we are in the /go/ root folder.
+WORKDIR ../
+RUN echo -e "#!/bin/sh\n" > start.sh
+RUN echo -e "`pwd`/google-cloud-sdk/bin/dev_appserver.py --host 0.0.0.0 `pwd`/apprtc/out/app.yaml &\n" >> start.sh
+
+# Collider setup
+
+# Go environment setup.
+RUN export GOPATH=$HOME/goWorkspace/
+RUN go env -w GO111MODULE=off
+RUN  ln -s `pwd`/apprtc/src/collider/collidermain $GOPATH/src
+RUN  ln -s `pwd`/apprtc/src/collider/collidertest $GOPATH/src
+RUN  ln -s `pwd`/apprtc/src/collider/collider $GOPATH/src
+WORKDIR $GOPATH/src
+
+# Download all the dependencies
+RUN go get collidermain
+
+# Install the package
+RUN go install collidermain
+
+# Add Collider executable to the start.sh bash script.
+WORKDIR ../
+RUN echo -e "$GOPATH/bin/collidermain -port=8089 -tls=false -room-server=http://localhost &\n" >> start.sh
+RUN echo -e "wait -n\n" >> start.sh
+RUN echo -e "exit $?\n" >> start.sh
+# Make it executable.
+RUN chmod +x start.sh
+
+# Start the bash wrapper that keeps both collider and the AppRTC GAE app running. 
+CMD ./start.sh
+
+## Instructions (Tested on Debian 11 only):
+# - Download the Dockerfile from the AppRTC repo and put it in a folder, e.g. apprtc
+# - Build the Dockerfile into an image: sudo docker build apprtc/
+#   Note the image ID from the build command, e.g. something like 'Successfully built 503621f4f7bd'.
+# - Run 'sudo docker run -p 8080:8080 -p 8089:8089 --rm -ti 503621f4f7bd'
+# - The container will now run in interactive mode and output logging. This can ofc be prevent if you run in 
+#   non-interactive mode. The -p are port mappings to the GAE app and Collider instances, the host ones can be changed.
+
+# On the same machine that this docker image is running on you can now join apprtc calls using 
+# http://localhost:8080/?wshpp=localhost:8089&wstls=false,  once you join the URL will have 
+# appended the room name which you can share, e.g. http://localhost:8080/r/315402015?wshpp=localhost:8089&wstls=false. 
+
+# Keep in mind that you need to pass in those 'wshpp' and 'wstls' URL parameters everytime you join with as they override 
+# the websocket server address and turns off secure websockets.
+
+# NOTE that localhost is special allowing getusermedia to be accessed without TLS. If you host it on a different hostname
+# or host alltogheter, TLS is most likely required unless you can do fancy forwarding (so that each client appears
+# to be using localhost but forwards the traffic to the machine running the docker container, not sure if this is possible).
+
+# NOTE it is possible to run docker without sudo but requires extra setup to do so.
+
+## TODO
+# Investigate if TLS support can be added using self signed certificates. 
+# Verify if this docker container run on more OS's?
+