CI: wip

tests/autoinstall_dockerfile

 ARG IMG
 FROM $IMG
-RUN apt update && apt install -y python3  # Required for ubuntu
+# For unbuntu:
+RUN apt update && apt install -y ca-certificates python3 && update-ca-certificates
 RUN useradd -s /bin/bash -m otbuser
 WORKDIR /home/otbuser
 USER otbuser