use proper Dockerfile for base image [ci skip]

Author: odelaere

.github/workflows/docker-hub-publish-base.yml

@@ -22,7 +22,7 @@ jobs:
         uses: docker/[email protected]
         with:
           context: .
-          file: ./docker/Dockerfile-ubuntu-20.04
+          file: ./docker/Dockerfile-base
           tags: imiobe/iadelib:base
           platforms: linux/amd64
           pull: true