Handle SNP CI on days where there are no merges (#4793)

.azure_pipelines_snp.yml

@@ -4,6 +4,7 @@ pr:
       - main
   paths:
     include:
+      - .github/workflows/build-ci-container.yml
       - .azure_pipelines_snp.yml
       - .azure-pipelines-templates/deploy_aci.yml
       - .azure-pipelines-templates/test_on_remote.yml

.github/workflows/build-ci-container.yml

@@ -16,12 +16,8 @@ on:
     branches:
       - main
       - release/3.x
-    paths:
-      - .github/workflows/build-ci-container.yml
-      - .azure_pipelines_snp.yml
-      - .azure-pipelines-templates/deploy_aci.yml
-      - .azure-pipelines-templates/test_on_remote.yml
-      - .snpcc_canary
+  schedule:
+    - cron: "0 9 * * Mon-Fri"
 
 env:
   ACR_REGISTRY: ccfmsrc.azurecr.io