Add custom Dockerfile with working FTS versions

Dockerfile

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+# Use working FTS versions from Dockerfile
+FROM ubuntu:20.04
+
+LABEL maintainer=FreeTAKTeam
+
+ARG FTS_VERSION=1.9
+ARG FTS_UI_VERSION=1.8.1
+
+# UTC for buildtimes
+RUN ln -fs /usr/share/zoneinfo/UTC /etc/localtime
+
+# APT
+RUN apt-get update && \
+    apt-get install -y libssl-dev libffi-dev curl python3 python3-pip \
+            libxml2-dev libxslt-dev python3-lxml python3-dev \
+            python3-setuptools build-essential iproute2 &&\
+    rm -rf /var/lib/apt/lists/*
+
+# PIP3
+RUN pip3 install supervisor &&\
+    pip3 install requests &&\
+    pip3 install flask-login &&\
+    pip3 install FreeTAKServer==${FTS_VERSION} && \
+    pip3 install FreeTAKServer-UI==${FTS_UI_VERSION} && \
+    pip3 install defusedxml &&\
+    pip3 install pyopenssl &&\
+    pip3 install pytak
+
+# Create FTS user
+RUN addgroup --gid 1000 fts && \
+    adduser --disabled-password --uid 1000 --ingroup fts --home /home/fts fts
+
+# Copy configuration files (will be provided at runtime)
+COPY docker-run.sh /home/fts/docker-run.sh
+RUN chmod +x /home/fts/docker-run.sh
+
+# FTS ports
+EXPOSE 8080 8087 8089 8443 9000 19023 5000
+
+WORKDIR /home/fts
+USER fts
+
+CMD ["/home/fts/docker-run.sh"]