Updated Dockerfile and entrypoint to use pm2 instead of forever

Dockerfile

@@ -44,4 +44,4 @@ COPY --chown=$UID:$GID [ "/backend/", "/app/" ]
 
 EXPOSE 17442
 ENTRYPOINT [ "/app/entrypoint.sh" ]
-CMD [ "pm2-runtime", "ecosystem.config.js" ]
+CMD [ "pm2-runtime", "pm2.config.js" ]

backend/entrypoint.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 set -eu
 
-CMD="pm2-runtime ecosystem.config.js"
+CMD="pm2-runtime pm2.config.js"
 
 # if the first arg starts with "-" pass it to program
 if [ "${1#-}" != "$1" ]; then

backend/pm2.config.js

@@ -0,0 +1,7 @@
+module.exports = {
+    apps : [{
+      name   : "YoutubeDL-Material",
+      script : "./app.js",
+      watch  : "placeholder"
+    }]
+}