Add missing init_user.sh script

.github/workflows/build-stacks.yml

@@ -43,6 +43,7 @@ jobs:
         filters: |
           unity_datascience: 
             - 'unity_datascience/**'
+            - 'common/**'
             - '.github/workflows/**'
             - '.env'
   build:

common/unity-sds/init_user.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+skel_src_dir=/etc/unity-sds/jupyter_skel
+user_dst_dir=/home/jovyan
+
+# Find files and directories in $skel_src_dir at the root level
+mapfile -t skel_config_fns < <(find $skel_src_dir -mindepth 1 -maxdepth 1 -printf '%f\n')
+
+# Only copy files if the destination in the Jupyter home directory does not exist
+for skel_fn in "${skel_config_fns[@]}"; do
+  if [ -e "${skel_src_dir}/${skel_fn}" ] && [ ! -e "${user_dst_dir}/${skel_fn}" ]; then
+    cp -a "${skel_src_dir}/${skel_fn}" "${user_dst_dir}/${skel_fn}"
+  fi
+done