base: Allow specifying custom Ubuntu mirror as build arg

This commit updates the base Dockerfile such that the Ubuntu mirrors
used while building the image is specifiable as build arguments.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

Dockerfile.base

@@ -6,6 +6,9 @@ ARG USERNAME=user
 ARG UID=1000
 ARG GID=1000
 ARG PYTHON_VENV_PATH=/opt/python/venv
+ARG UBUNTU_MIRROR_ARCHIVE=archive.ubuntu.com/ubuntu
+ARG UBUNTU_MIRROR_SECURITY=security.ubuntu.com/ubuntu
+ARG UBUNTU_MIRROR_PORTS=ports.ubuntu.com/ubuntu-ports
 
 # this conflicts with uid 1000, remove it
 RUN userdel -r ubuntu || true
@@ -16,6 +19,11 @@ SHELL ["/bin/bash", "-c"]
 # Set non-interactive frontend for apt-get to skip any user confirmations
 ENV DEBIAN_FRONTEND=noninteractive
 
+# Set up Ubuntu mirrors
+RUN sed -i "s#archive.ubuntu.com/ubuntu#${UBUNTU_MIRROR_ARCHIVE}#" /etc/apt/sources.list.d/ubuntu.sources && \
+	sed -i "s#security.ubuntu.com/ubuntu#${UBUNTU_MIRROR_SECURITY}#" /etc/apt/sources.list.d/ubuntu.sources && \
+	sed -i "s#ports.ubuntu.com/ubuntu-ports#${UBUNTU_MIRROR_PORTS}#" /etc/apt/sources.list.d/ubuntu.sources
+
 # Install base packages
 RUN apt-get -y update && \
 	apt-get -y upgrade && \