Add default account "droid"

1. no password for sudo
2. ttyd automatically login into droid without asking password
3. uid is 1000

Bug: 363235770
Test: check if a user can user 'droid' without login in terminall app
Change-Id: I3382df2e8e6a4ed7fd591d18a0123c559bdc2aed
diff --git a/build/debian/fai_config/files/etc/systemd/system/ttyd.service/AVF b/build/debian/fai_config/files/etc/systemd/system/ttyd.service/AVF
index f71557d..6b932e9 100644
--- a/build/debian/fai_config/files/etc/systemd/system/ttyd.service/AVF
+++ b/build/debian/fai_config/files/etc/systemd/system/ttyd.service/AVF
@@ -3,7 +3,7 @@
 After=syslog.target
 After=network.target
 [Service]
-ExecStart=/usr/local/bin/ttyd -W screen -aAxR -S main login
+ExecStart=/usr/local/bin/ttyd -W screen -aAxR -S main login -f droid
 Type=simple
 Restart=always
 User=root
diff --git a/build/debian/fai_config/scripts/AVF/20-useradd b/build/debian/fai_config/scripts/AVF/20-useradd
new file mode 100755
index 0000000..9fbcd43
--- /dev/null
+++ b/build/debian/fai_config/scripts/AVF/20-useradd
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+$ROOTCMD useradd -m -u 1000 -N -G sudo droid
+$ROOTCMD echo 'droid ALL=(ALL) NOPASSWD:ALL' >> $target/etc/sudoers
\ No newline at end of file