Dockerfile: put back EXPOSE directive (#12279)
[Rkt](https://coreos.com/rkt) doesn't allow ports to be exposed to containers unless they are declared in the container manifest. Re-adding EXPOSE back in (removed in 1dbf993bce) allows the container to be used on rkt based systems.
			
			
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						Eugen Rochko
					
				
			
			
				
	
			
			
			
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			@@ -123,3 +123,4 @@ RUN cd ~ && \
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# Set the work dir and the container entry point
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WORKDIR /opt/mastodon
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ENTRYPOINT ["/tini", "--"]
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EXPOSE 3000 4000
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