Update and rename porter_stack_stefan-testcachemultistep.yml to porter_stack_stefantest-graviton.yml

Author: stefanmcshane

.github/workflows/porter_stack_stefan-testcachemultistep.yml renamed to .github/workflows/porter_stack_stefantest-graviton.yml

@@ -31,7 +31,7 @@ jobs:
         PORTER_PR_NUMBER: ${{ github.event.number }}
         PORTER_PROJECT: "8"
         PORTER_REPO_NAME: ${{ github.event.repository.name }}
-        PORTER_STACK_NAME: stefan-testcachemultistep
+        PORTER_APP_NAME: stefantest-graviton
         PORTER_TAG: ${{ steps.vars2.outputs.sha_long }}
         PORTER_TOKEN: ${{ secrets.PORTER_STACK_8_11 }}
         GH_TOKEN: ${{ github.token }}