tf-m-extra-build: Adds nightly_all_plat to default

Adds the new nightly_all_plat group to the default timer based run of
the job. This is to ensure we are testing the build of each platform
nightly.

Change-Id: Ifeb2eaba540cdad2b899445f8aa8f318c58e1a2e
Signed-off-by: Matthew Dalzell <matthew.dalzell@arm.com>
diff --git a/tf-m-extra-build.yaml b/tf-m-extra-build.yaml
index 3a6be55..976d920 100644
--- a/tf-m-extra-build.yaml
+++ b/tf-m-extra-build.yaml
@@ -23,7 +23,8 @@
           name: 'FILTER_GROUP'
           default: "an524 cs300_an547 cs300_an552 corstone310 rse_tc4 \
                     cypress_psoc64 corstone1000 \
-                    stm_nucleo_l552ze_q stm_stm32h573i_dk nxp_lpcxpresso55s69"
+                    stm_nucleo_l552ze_q stm_stm32h573i_dk nxp_lpcxpresso55s69 \
+                    nightly_all_plat"
           description: |
             Filter to a group of configurations as recognised by configs.py
       - string: