Change org name var to string (#26)

Author: cjreed121

.github/workflows/docker-build-push.yml

@@ -10,7 +10,7 @@ jobs:
     uses: submitty/action-docker-build/.github/workflows/[email protected]
     with:
       push: true
-      docker_org_name: ${{ vars.docker_org_name }}
+      docker_org_name: submittyrpi
       base_commit: ${{ github.event.before }}
       head_commit: ${{ github.event.after }}
     secrets: