The Typescript SDK is not compatible with the runtime Nodejs 12

[hoh]

Describe the bug

The Typescript SDK is incompatible with the current runtime since only Nodejs 12 is provided - and the SDK requires a more recent version.

We should install a recent version of Nodejs when creating the runtime rootfs instead of using the version provided by Debian 11 Bullseye.

Installing it from Nodesource looks like a recommended approach:
https://github.com/nodesource/distributions/blob/master/README.md

[hoh]

This may be enough:

diff --git a/runtimes/aleph-debian-11-python/create_disk_image.sh b/runtimes/aleph-debian-11-python/create_disk_image.sh
index 7fbb620..c6a10e8 100755
--- a/runtimes/aleph-debian-11-python/create_disk_image.sh
+++ b/runtimes/aleph-debian-11-python/create_disk_image.sh
@@ -22,7 +22,6 @@ apt-get install -y --no-install-recommends --no-install-suggests \
   python3-setuptools \
   python3-pip python3-cytoolz python3-pydantic \
   iproute2 unzip \
-  nodejs npm \
   build-essential python3-dev
 
 pip3 install 'fastapi~=0.71.0'
@@ -33,6 +32,10 @@ pip3 install 'aleph-client>=0.4.6' 'coincurve==15.0.0'
 # Compile all Python bytecode
 python3 -m compileall -f /usr/local/lib/python3.9
 
+# Install Nodejs 18
+curl -fsSL https://deb.nodesource.com/setup_18.x | bash -
+apt-get install -y nodejs
+
 echo "root:toor" | /usr/sbin/chpasswd
 
 mkdir -p /overlay