fix download URL

.docker/dockerfiles/latest/Dockerfile

@@ -18,7 +18,7 @@ WORKDIR /app
 
 RUN URL="https://github.com/RocketChat/Rocket.Chat/releases/latest" \
 &&  FILE="/rocket.chat.tgz" \
-&&  HEADER=$(curl -I -s "$URL" | grep -Fi Location: | sed -En 's/.*(https?:\/\/[a-zA-Z0-9\/.-_]*).*$/\1/p') | sed 's/\/tag\//\/download\//' \
+&&  HEADER=$(curl -I -s "$URL" | grep -Fi Location: | sed -En 's/.*(https?:\/\/[a-zA-Z0-9\/.-_]*).*$/\1/p' | sed 's/\/tag\//\/download\//' ) \
 &&  curl -fSL "$HEADER$FILE" -o rocket.chat.tgz \
 &&  tar zxvf ./rocket.chat.tgz \
 &&  rm ./rocket.chat.tgz  \