fix: add ca-certificates

Dockerfile

@@ -1,13 +1,16 @@
 FROM ubuntu:focal
 
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends ca-certificates
+
 RUN mkdir --parents --mode=0755 /etc/apt/keyrings
 RUN wget https://repo.radeon.com/rocm/rocm.gpg.key -O - | gpg --dearmor | tee /etc/apt/keyrings/rocm.gpg
 
 RUN echo "deb [arch=amd64 signed-by=/etc/apt/keyrings/rocm.gpg] https://repo.radeon.com/rocm/apt/debian focal main" | tee /etc/apt/sources.list.d/rocm.list
 RUN echo -e 'Package: *\nPin: release o=repo.radeon.com\nPin-Priority: 600' | tee /etc/apt/preferences.d/rocm-pin-600
 
 RUN apt-get update
-RUN apt-get install rocm-hip-libraries
+RUN apt-get install -y --no-install-recommends rocm-hip-libraries
 
 RUN python -m venv /root/.uruha_python
 RUN /root/.uruha_python/bin/pip install ipython