Improve peertube upgrade

src/freedombone-app-peertube

     function_check set_repo_commit
     set_repo_commit $PEERTUBE_DIR "peertube commit" "$PEERTUBE_COMMIT" $PEERTUBE_REPO
 
-    cd "$PEERTUBE_DIR/scripts" || exit 7824552627
-    sudo -u peertube ./upgrade.sh $PEERTUBE_DIR
+    if ! npm install -g yarn@1.5.1; then
+        echo $'Failed to install yarn'
+        exit 79353234
+    fi
+    yarn add -D webpack --network-concurrency 1
+    if ! yarn install; then
+        echo $'Failed to run yarn install'
+        exit 63754235
+    fi
+    if ! npm install -g npm@4; then
+        # https://github.com/KraigM/homebridge-harmonyhub/issues/119
+        echo $'Failed to downgrade npm'
+        npm install -g "npm@${NPM_VERSION}"
+        cp /root/.npm-global/bin/npm /usr/local/bin/npm
+        exit 3476835
+    fi
+    cp /root/.npm-global/bin/npm /usr/local/bin/npm
+    if ! npm install; then
+        echo $'Failed to install peertube'
+        npm install -g "npm@${NPM_VERSION}"
+        cp /root/.npm-global/bin/npm /usr/local/bin/npm
+        exit 7835243
+    fi
+    if ! npm install -g "npm@${NPM_VERSION}"; then
+        echo $'Failed to restore npm after downgrade'
+        exit 5737583
+    fi
+    cp /root/.npm-global/bin/npm /usr/local/bin/npm
+    npm run build
+
+    # This doesn't appear to work
+    #sudo -u peertube ./upgrade.sh $PEERTUBE_DIR
 
     chown -R peertube:peertube $PEERTUBE_DIR
     systemctl start peertube
         exit 5737583
     fi
     cp /root/.npm-global/bin/npm /usr/local/bin/npm
-    if ! npm run build; then
-        echo $'Failed to build peertube'
-        exit 5293593
-    fi
+    npm run build
 
     PEERTUBE_ONION_HOSTNAME=$(add_onion_service peertube 80 ${PEERTUBE_ONION_PORT})