lava-templates: Allow to override job priority

The idea is to pass it as a param from a top-level job, e.g. make
tf-a-daily (background job) to use "low" priority, to give more
priority to "interactive" jobs, like patch testing.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I216d5f9693512945c95bb55c14090d575d82696c
diff --git a/script/lava-templates/juno-scp-tests-scmi.yaml b/script/lava-templates/juno-scp-tests-scmi.yaml
index f625dd3..6eac52b 100644
--- a/script/lava-templates/juno-scp-tests-scmi.yaml
+++ b/script/lava-templates/juno-scp-tests-scmi.yaml
@@ -15,7 +15,7 @@
     lava-test-monitor:
       seconds: 180
 
-priority: medium
+priority: ${LAVA_PRIORITY:-medium}
 visibility: public
 
 actions: