update CI workflow to use ubuntu-latest for build and deploy jobs

.gitea/workflows/master.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   build:
     name: Build and Push Docker Image (amd64 and arm64)
-    runs-on: self-hosted-ubuntu-latest
+    runs-on: ubuntu-latest
 
     steps:
       - uses: actions/checkout@v4
@@ -66,7 +66,7 @@ jobs:
 
   deploy_live:
     name: Deploy Live
-    runs-on: self-hosted-ubuntu-latest
+    runs-on: ubuntu-latest
     needs: build
 
     steps: