Update Dockerfile

Dockerfile

-FROM alpine:3.8
+FROM ubuntu:18.04
 
 ARG PEERTUBE_VER=v1.1.0
 WORKDIR /var/www/peertube
-RUN adduser -h /var/www/peertube -s /bin/sh -D peertube && \
-    chown peertube:peertube /var/www/peertube
-
-RUN apk -U upgrade && \
-    apk add ca-certificates ffmpeg nodejs nodejs-npm openssl yarn && \
-    apk add -U vips-dev fftw-dev --repository http://dl-cdn.alpinelinux.org/alpine/edge/main/ --repository http://dl-cdn.alpinelinux.org/alpine/edge/testing/ && \
-    update-ca-certificates && \
-    apk add --virt .dep curl git g++ python make unzip && \
-    su peertube -c 'curl -sL "https://github.com/Chocobozzz/PeerTube/releases/download/$PEERTUBE_VER/peertube-$PEERTUBE_VER.zip" > peertube-$PEERTUBE_VER.zip && \
-    unzip -q peertube-$PEERTUBE_VER.zip && \
-    rm peertube-$PEERTUBE_VER.zip && \
-    mv peertube-$PEERTUBE_VER peertube-latest && \
-    cd peertube-latest && \
-    yarn install --production --pure-lockfile && \
-    yarn cache clean' && \
-    apk del .dep && \
-    rm -rf /tmp/* /var/cache/apk/*
+RUN useradd -m -d /var/www/peertube -s /bin/bash -p peertube peertube && passwd peertube
+#&& chown peertube:peertube /var/www/peertube
+
+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-${VERSION}.zip
+RUN cd ../ && -u peertube ln -s versions/peertube-${VERSION} ./peertube-latest
+