[CI] ensure node is installed

.gitea/workflows/build.yml

@@ -38,6 +38,11 @@ jobs:
       fail-fast: false
       matrix: ${{fromJson(needs.matrix.outputs.matrix)}}
     steps:
+      - name: Install dependencies
+        run: |
+          apt-get update
+          apt-get install --yes --no-install-recommends \
+            nodejs
       - name: Prepare variables
         id: variables
         run: |