ci: support maven install without sudo

.gitea/workflows/build.yml

@@ -24,8 +24,13 @@ jobs:
       - name: Install Maven
         run: |
           if ! command -v mvn >/dev/null 2>&1; then
-            sudo apt-get update
-            sudo apt-get install -y maven
+            if command -v sudo >/dev/null 2>&1; then
+              sudo apt-get update
+              sudo apt-get install -y maven
+            else
+              apt-get update
+              apt-get install -y maven
+            fi
           fi
 
       - name: Set up Node