Simplify Dockerfile (#3976)

Now a newer version of node is available from standard sources, we don't need the previous workaround

.devcontainer/Dockerfile

@@ -9,15 +9,10 @@ ARG TARGETARCH
 # APT dependencies
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update \
-    && apt-get -y install --no-install-recommends bash-completion software-properties-common lsb-release graphviz zip \
+    && apt-get -y install --no-install-recommends bash-completion software-properties-common lsb-release graphviz zip nodejs npm \
     # install az-cli
     && curl -sL https://aka.ms/InstallAzureCLIDeb | bash -
 
-# For Hugo we need a newer version of NodeJS than the v12.22.12 available via the standard sources
-RUN curl -fsSL https://deb.nodesource.com/setup_18.x -o /tmp/nodesource-setup.sh \
-    && sudo bash /tmp/nodesource-setup.sh \
-    && apt-get -y install nodejs
-
 # install docker
 # - not yet needed?
 # RUN curl -fsSL https://get.docker.com | sh -