fix(actions): Workflow condition syntax for deployment (#21630)

The deployment conditional was using mixed syntax styles which can cause unexpected behavior.
Changed to use consistent expression format for the entire condition.

Author: ericboehs

.github/workflows/build.yml

@@ -77,7 +77,7 @@ jobs:
           cache-to: type=inline
   deploy:
     needs: build_and_push
-    if: github.event.workflow_run.head_branch == 'master' && ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: ${{ github.event.workflow_run.head_branch == 'master' && github.event.workflow_run.conclusion == 'success' }}
     uses: department-of-veterans-affairs/vets-api/.github/workflows/deploy-template.yml@master
     with:
       ecr_repository: "vets-api"