initial dockerfile for prosody

Dockerfile

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+FROM debian:stable-slim
+
+RUN apt-get update && \
+    apt-get install extrepo -y && \
+    extrepo enable prosody && \
+    apt-get update && \
+    apt-get install prosody -y
+
+RUN mkdir -p /run/prosody/ && \
+    chown -R prosody:prosody /run/prosody/
+
+RUN mkdir -p /etc/prosody/conf.d/
+
+COPY prosody.cfg.lua /etc/prosody/prosody.cfg.lua
+
+EXPOSE 5222
+EXPOSE 5269
+
+CMD ["prosody", "-F"]
+
+USER prosody