move to ubuntu as requested

Use setup node 16, as LTS im afraid it will jump to node 18 few months later.

Dockerfile

@@ -1,26 +1,39 @@
+# When using ubuntu:22.04 there is weird disconnection issue
 FROM debian:bullseye-slim AS ffmpeg
 ENV DEBIAN_FRONTEND=noninteractive
 COPY ffmpeg-fetch.sh .
 RUN sh ./ffmpeg-fetch.sh
 
-
-# Build frontend
-FROM node:16-bullseye-slim as frontend
+# Create our Ubuntu 22.04 with node 16
+FROM ubuntu:22.04 AS base
 ENV DEBIAN_FRONTEND=noninteractive
-RUN npm -g install npm && \
-    npm install -g @angular/cli
+ENV UID=1000
+ENV GID=1000
+ENV USER=youtube
+ENV NO_UPDATE_NOTIFIER=true
+ENV PM2_HOME=/app/pm2
+RUN groupadd -g $GID $USER && useradd --system -g $USER --uid $UID $USER && \
+    apt update && \
+    apt install -y --no-install-recommends curl ca-certificates && \
+    curl -fsSL https://deb.nodesource.com/setup_16.x | bash - && \
+    apt install -y --no-install-recommends nodejs && \
+    npm -g install npm && \
+    apt clean && \
+    rm -rf /var/lib/apt/lists/*
+        
+# Build frontend
+FROM base as frontend
+RUN npm install -g @angular/cli
 WORKDIR /build
 COPY [ "package.json", "package-lock.json", "angular.json", "tsconfig.json", "/build/" ]
 COPY [ "src/", "/build/src/" ]
 RUN npm install && \
     npm run build && \
-    ls -al backend/public
+    ls -al /build/backend/public
 
 
 # Install backend deps
-FROM node:16-bullseye-slim as backend
-ENV NO_UPDATE_NOTIFIER=true
-ENV DEBIAN_FRONTEND=noninteractive
+FROM base as backend
 WORKDIR /app
 COPY [ "backend/","/app/" ]
 RUN npm config set strict-ssl false && \
@@ -28,27 +41,22 @@ RUN npm config set strict-ssl false && \
     ls -al
 
 # Final image
-FROM node:16-bullseye-slim
-ENV NO_UPDATE_NOTIFIER=true
-ENV DEBIAN_FRONTEND=noninteractive
-ENV PM2_HOME=/app/pm2
-ENV UID=1000
-ENV GID=1000
-RUN npm -g install npm && \
-    npm install -g pm2 && \
+FROM base
+RUN npm install -g pm2 && \
     apt update && \
-    apt install -y --no-install-recommends gosu python3-minimal python-is-python3 atomicparsley ca-certificates && \
+    apt install -y --no-install-recommends gosu python3-minimal python-is-python3 atomicparsley && \
     apt clean && \
     rm -rf /var/lib/apt/lists/*
 WORKDIR /app
-# User 1000 already exist as node
+# User 1000 already exist from base image
 COPY --chown=$UID:$GID --from=ffmpeg [ "/usr/local/bin/ffmpeg", "/usr/local/bin/ffmpeg" ]
 COPY --chown=$UID:$GID --from=ffmpeg [ "/usr/local/bin/ffprobe", "/usr/local/bin/ffprobe" ]
 COPY --chown=$UID:$GID --from=backend ["/app/","/app/"]
 COPY --chown=$UID:$GID --from=frontend [ "/build/backend/public/", "/app/public/" ]
-# Add some persistence data
+
+#Add some persistence data
 VOLUME ["/app/appdata"]
 
 EXPOSE 17442
 ENTRYPOINT [ "/app/entrypoint.sh" ]
-CMD [ "pm2-runtime", "--raw", "pm2.config.js" ]
+CMD [ "pm2-runtime","--raw","pm2.config.js" ]