Adjust TF-PSA-Crypto CI for production use

Restore log retention, and only trust the upstream Jenkinsfile

This reverts commit 37c29351a198f7acf5ff789dda6023c106bf3e0c.

Change-Id: I35d070eb55af44ef8a6b1dd9c0c3d2b5bf883871
diff --git a/mbed-tls-tf-psa-crypto-multibranch.yaml b/mbed-tls-tf-psa-crypto-multibranch.yaml
index 730ea29..685c824 100644
--- a/mbed-tls-tf-psa-crypto-multibranch.yaml
+++ b/mbed-tls-tf-psa-crypto-multibranch.yaml
@@ -4,8 +4,8 @@
     project-type: multibranch
     disabled: false
     prune-dead-branches: true
-    days-to-keep: 0
-    num-to-keep: 0
+    days-to-keep: 60
+    num-to-keep: 1000
     script-path: tests/.jenkins/Jenkinsfile
     properties:
       - raw:
@@ -42,9 +42,9 @@
         repo: TF-PSA-Crypto
         branch-discovery: all
         discover-pr-forks-strategy: both
-        discover-pr-forks-trust: permission
+        discover-pr-forks-trust: nobody
         discover-pr-origin: both
-        head-filter-regex: 'PR-118-(head|merge)'
+        head-filter-regex: 'PR-\d+-(head|merge)|gh-readonly-queue/.*'
         status-checks:
           skip: true
           skip-branch-source-notifications: true