Handle arch in dockerfile and add PR template (#109)

* repo: add a pull request template

* Dockerfile: include arch when copying

Thanks @yush1ga and @zerdos

Dockerfile

@@ -18,7 +18,7 @@ RUN yarn && yarn task build:server:binary
 # We deploy with ubuntu so that devs have a familiar environemnt.
 FROM ubuntu:18.10
 WORKDIR /root/project
-COPY --from=0 /src/packages/server/cli-linux /usr/local/bin/code-server
+COPY --from=0 /src/packages/server/cli-linux-x64 /usr/local/bin/code-server
 EXPOSE 8443
 RUN apt-get update && apt-get install -y \
 	openssl \