ioc: allow pip to install packages system-wide.

Since Debian 12, installing packages outside a virtual environment is an
error by default [1] as first specified by PEP 668 [2]. The rationale
for forcing this is not applicable in our context, since the container
image is dedicated to the IOC under construction, which renders it an
isolated environment of its own.

Users should still provide RUNTIME_PIP_PACKAGES that are compatible with
the system packages, not really breaking the system, similarly to what
is done for shared libraries.

[1] https://salsa.debian.org/python-team/packages/python-pip/-/commit/5aeba2464e36020a34e2bc074872771f5ef4973d
[2] https://peps.python.org/pep-0668

Fixes: 39bb0d4 (base: update to Debian 12., 2024-10-31)

Dockerfile

@@ -30,7 +30,7 @@ COPY --from=build-image /usr/local/bin/lnls-get-n-unpack /usr/local/bin/lnls-get
 RUN lnls-get-n-unpack -r $RUNTIME_TAR_PACKAGES && \
     ldconfig
 RUN if [ -n "$RUNTIME_PIP_PACKAGES" ]; then \
-        pip install $RUNTIME_PIP_PACKAGES; \
+        pip install --break-system-packages $RUNTIME_PIP_PACKAGES; \
     fi
 
 COPY --from=build-image /usr/local/bin/lnls-run /usr/local/bin/lnls-run