Per-Patch: Trigger per-patch job on main branch

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I05dfb830658025d6bee2483ecf5c3b1b10137886
diff --git a/tf-m-static.yaml b/tf-m-static.yaml
index b6bcfe7..4c10938 100644
--- a/tf-m-static.yaml
+++ b/tf-m-static.yaml
@@ -132,7 +132,7 @@
                 project-pattern: 'TF-M/trusted-firmware-m'
                 branches:
                   - branch-compare-type: 'REG_EXP'
-                    branch-pattern: 'master'
+                    branch-pattern: 'main'
           override-votes: true
           gerrit-build-successful-verified-value: 1
           gerrit-build-failed-verified-value: -1