Add backend CI/CD workflow

.gitea/workflows/backend.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   build:
-    runs-on: [psgcicd01]   # your central build runner
+    runs-on: [cicd]   # your central build runner
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
@@ -28,7 +28,7 @@ jobs:
           path: build/libs/*.jar
 
   deploy:
-    runs-on: [psgbuild01]   # your backend host runner
+    runs-on: [backend]   # your backend host runner
     needs: build
     steps:
       - name: Download artifact