Redirect system-wide pip install to /usr/local

Author: olupton

.github/container/Dockerfile.base

@@ -124,18 +124,17 @@ git apply </opt/pip/pip-vcs-equivalency.patch
 git add -u
 git commit -m 'Adds JAX_TOOLBOX_VCS_EQUIVALENCY as a trigger to treat all github VCS installs for a package as equivalent. The spec of the last encountered version will be used'
 EOF
-# Container architecture currently uses pip to container-globally install using pip
-ENV PIP_BREAK_SYSTEM_PACKAGES=1
 RUN <<EOF bash -e
 PIP_PYZ_DIR=$(mktemp -d)
 pushd "${PIP_PYZ_DIR}"
 curl -O https://bootstrap.pypa.io/pip/pip.pyz
 chmod +x ./pip.pyz
 ! pip && ! pip3 # there should not already be a pip
-python pip.pyz install --no-cache-dir -e /opt/pip
+python pip.pyz install --no-cache-dir --prefix=/usr -e /opt/pip
 popd
 rm -rf "${PIP_PYZ_DIR}"
-# Make sure that any later attempt to install `python3-pip` will fail
+pip config set global.prefix /usr
+# Make sure that any later attempt to install python3-pip will fail
 cat >/etc/apt/preferences.d/no-system-pip <<EOL
 # A patched pip is installed at /opt/pip.
 Package: python3-pip