tls13_only: add tls13_only test component

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index bd38cdb..e387cbf 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -2705,6 +2705,14 @@
     armc6_build_test "--target=aarch64-arm-none-eabi -march=armv8.2-a"
 }
 
+component_test_tls13_only_build () {
+    msg "build: default config with MBEDTLS_SSL_PROTO_TLS1_3 only, without MBEDTLS_SSL_PROTO_TLS1_2"
+    make CFLAGS="'-DMBEDTLS_USER_CONFIG_FILE=\"../tests/configs/tls13-only.h\"'"
+
+    msg "ssl-opt.sh (TLS 1.3)"
+    if_build_succeeded tests/ssl-opt.sh
+}
+
 component_test_tls13 () {
     msg "build: default config with MBEDTLS_SSL_PROTO_TLS1_3 enabled, without padding"
     scripts/config.py set MBEDTLS_SSL_PROTO_TLS1_3