greetd: add pam configuration

- pass pam environment
- unlock keyring on login
- dont require bash

recipes-support/greetd/greetd/greetd.pam

@@ -1,9 +1,11 @@
 #%PAM-1.0
 auth requisite pam_nologin.so
 auth include common-auth
+auth required pam_env.so
+auth optional pam_gnome_keyring.so
 account include common-account
 password include common-password
 session required pam_loginuid.so
 session optional pam_keyinit.so force revoke
 session include common-session
-
+session optional pam_gnome_keyring.so auto_start

recipes-support/greetd/greetd_git.bb

@@ -154,7 +154,7 @@ do_install:append() {
 }
 
 USERADD_PACKAGES = "${PN}"
-USERADD_PARAM:${PN} = "--system --user-group --groups video --no-create-home --shell /bin/bash greeter"
+USERADD_PARAM:${PN} = "--system --user-group --groups video --no-create-home --shell /bin/sh greeter"
 
 FILES:${PN} += "${sysconfdir} ${systemd_system_unitdir}"