#1: try fix variable in azure ci for cache

Author: tlamonthezie

.azure/pipelines/build-and-test.yml

@@ -98,6 +98,8 @@ jobs:
     - task: Cache@2
       displayName: Update cache
       continueOnError: true
+      variables:
+        cache_name: $(name)
       inputs:
         securityNamespace: cache
         key: $(Agent.OS) | "$(cache_name)" | $(TS_YEAR) | $(TS_MONTH) | $(TS_DAY) | $(TS)