Temporarily override the variant map specified in the internal repo

Author: stevebux

.github/workflows/stage-3-build.yaml

@@ -153,7 +153,9 @@ jobs:
             --targetAccountGroup "nhs-notify-supplier-api-dev" \
             --terraformAction "apply" \
             --overrideProjectName "nhs" \
-            --overrideRoleName "nhs-main-acct-supplier-api-github-deploy"
+            --overrideRoleName "nhs-main-acct-supplier-api-github-deploy" \
+            --overrides 'letter_variant_map={"lv1":{"supplierId":"supplier1","specId":"spec1","priority":10},"lv2":{"supplierId":"supplier1","specId":"spec2","priority":10},"lv3":{"supplierId":"supplier2","specId":"spec3","priority":10}}'
+# Don't forget to remove this override!
   artefact-proxies:
     name: "Build proxies"
     runs-on: ubuntu-latest