Added slate dockerfile, run script

slate/Dockerfile

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+FROM ruby:2.7.3
+EXPOSE 4567
+
+RUN apt-get update && apt-get install -y git nodejs
+RUN git clone https://github.com/OpenDroneMap/WebODM /webodm --depth 1 
+
+WORKDIR /webodm/slate
+RUN bundle install
+
+ENTRYPOINT ["bundle", "exec", "middleman", "server"]

slate/run_server.bat

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+REM Building docker image
+if "%1"=="--build" docker build -t opendronemap/webodm_slate .
+
+REM Launching server
+docker run -ti --rm -v %CD%:/webodm/slate -p 4567:4567 opendronemap/webodm_slate --watcher-force-polling