Update and rename main_gfm-backend.yml to main_gfmb.yml

Author: herin7

.github/workflows/main_gfm-backend.yml .github/workflows/main_gfmb.yml.github/workflows/main_gfm-backend.yml renamed to .github/workflows/main_gfmb.yml

@@ -54,7 +54,7 @@ jobs:
       - name: 'Deploy to Azure Web App'
         uses: azure/webapps-deploy@v3
         with:
-          app-name: 'gfm-backend'
+          app-name: 'gfmb'
           slot-name: 'Production'
           package: .