use onlyoffice/documentserver image

.forgejo/workflows/test-build.yaml

@@ -6,7 +6,7 @@ jobs:
   build-test:
     runs-on: x86_64
     container:
-      image: ubuntu:16.04
+      image: onlyoffice/documentserver:8.1.1.39
     env:
       pkgver: 8.1.1
       buildno: 39
@@ -19,8 +19,9 @@ jobs:
           apt-get update
           apt-get install -y nodejs
           npm install -g pkg grunt grunt-cli
+          cat /etc/os-release
       - name: Getting patches
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Cloning document server source
         run: git clone https://github.com/ONLYOFFICE/DocumentServer --recursive -b v$pkgver onlyoffice-document-server
       - name: Cloning build tools