Added build docker images for debian and others

builder/startup/generate_container_user

@@ -0,0 +1,37 @@
+# Set current user in nss_wrapper
+USER_ID=$(id -u)
+GROUP_ID=$(id -g)
+echo "USER_ID: $USER_ID, GROUP_ID: $GROUP_ID"
+
+# Attempt to set the username to the kasm username
+USERNAME=${VNC_USER:-default}
+# Make the username posix compliant
+USERNAME=$(echo "$USERNAME" | sed -r 's#[^a-zA-Z0-9\._\-]#_#g')
+if ! echo "$USERNAME" | grep -qP "^[a-zA-Z0-9_\.][a-zA-Z0-9_\-\.]*"; then
+    USERNAME="default"
+fi
+export PS1="$USERNAME:\w\$ "
+
+if [ x"$USER_ID" != x"0" ]; then
+
+    NSS_WRAPPER_PASSWD=/tmp/passwd
+    NSS_WRAPPER_GROUP=/etc/group
+
+    cat /etc/passwd > $NSS_WRAPPER_PASSWD
+
+    echo "${USERNAME}:x:${USER_ID}:${GROUP_ID}:Default Application User:${HOME}:/bin/bash" >> $NSS_WRAPPER_PASSWD
+
+    export NSS_WRAPPER_PASSWD
+    export NSS_WRAPPER_GROUP
+
+    if [ -r /usr/lib/libnss_wrapper.so ]; then
+        LD_PRELOAD=/usr/lib/libnss_wrapper.so
+    elif [ -r /usr/lib64/libnss_wrapper.so ]; then
+        LD_PRELOAD=/usr/lib64/libnss_wrapper.so
+    else
+        echo "no libnss_wrapper.so installed!"
+        exit 1
+    fi
+    echo "nss_wrapper location: $LD_PRELOAD"
+    export LD_PRELOAD
+fi