Changed build workflow to run in container

.gitea/workflows/build.yml

@@ -6,12 +6,8 @@ jobs:
 
   # Build image and push to container registry
   docker-build:
-    runs-on: linux_x64
+    runs-on: ubuntu-20.04
     steps:
-    - name: Set up Node.js
-      uses: actions/setup-node@v2
-      with:
-        node-version: '16'
     - uses: actions/checkout@v4
       with:
         submodules: recursive