feat: add pam template for FreeBSD

etc/pam.d/sshd.freebsd

@@ -0,0 +1,13 @@
+# PAM configuration for the Secure Shell service
+
+auth       optional     pam_echo.so       Your account has Multi-Factor Authentication enabled, an additional authentication factor is required (password).
+auth       optional     pam_exec.so       capture_stdout /opt/bastion/bin/shell/pam_exec_pwd_info.sh
+auth       required     pam_unix.so
+
+account    required     pam_nologin.so
+account    required     pam_login_access.so
+account    required     pam_unix.so
+
+session    required     pam_permit.so
+
+password   required     pam_unix.so       no_warn try_first_pass