workflows: disable Docker image build

No Dockaer is installed at the self-hosted runner, and GirHub-hosted
runners have too low usage limits, thus I'm disabling this job until we
make this repo public.

Signed-off-by: Anna Shaleva <[email protected]>

Author: AnnaShaleva

.github/workflows/build.yml

@@ -88,6 +88,7 @@ jobs:
   build_image:
     name: Build and push Docker image
     runs-on: ubuntu-22.04
+    if: false
 
     steps:
       - uses: actions/checkout@v4