Update Dockerfile

Dockerfile

@@ -6,7 +6,7 @@ RUN useradd -m -d /var/www/peertube -s /bin/bash -p peertube peertube && echo "p
 #&& chown peertube:peertube /var/www/peertube
 
 RUN apt-get update && apt-get install -y curl
-RUN $ VERSION=$(curl -s https://api.github.com/repos/chocobozzz/peertube/releases/latest | grep tag_name | cut -d '"' -f 4) && echo "Latest Peertube version is $VERSION, current version is $PEERTUBE_VER"
+RUN VERSION=$(curl -s https://api.github.com/repos/chocobozzz/peertube/releases/latest | grep tag_name | cut -d '"' -f 4) && echo "Latest Peertube version is $VERSION, current version is $PEERTUBE_VER"
 RUN cd /var/www/peertube && -u peertube mkdir config storage versions
 RUN cd versions && -u peertube wget -q "https://github.com/Chocobozzz/PeerTube/releases/download/${VERSION}/peertube-${VERSION}.zip"
 RUN  -u peertube unzip peertube-${VERSION}.zip && sudo -u peertube rm peertube-${VERSION}.zip