increase build-discarder times to 180

Increasing build-discarder's days-to-keep and nums-to-keep to 180 allows the CI
to keep jobs results for at least one week considering current TF-A patchset
activity. This effectively doubles the current value which is 90.

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: I0b45bc155b0ae79098be5e5d9b7cbc4a55bb0019
diff --git a/tf-a-builder.yaml b/tf-a-builder.yaml
index 99c816c..a42ea88 100644
--- a/tf-a-builder.yaml
+++ b/tf-a-builder.yaml
@@ -43,8 +43,8 @@
     defaults: global
     properties:
         - build-discarder:
-            days-to-keep: 90
-            num-to-keep: 90
+            days-to-keep: 180
+            num-to-keep: 180
     parameters:
         - string:
             name: import_cc