Add support to package install with pip.

Dockerfile

@@ -8,6 +8,7 @@ ARG RUNDIR
 ARG ENTRYPOINT=/usr/local/bin/lnls-run
 ARG RUNTIME_PACKAGES
 ARG RUNTIME_TAR_PACKAGES
+ARG RUNTIME_PIP_PACKAGES
 
 RUN apt update -y && \
     apt install -y --no-install-recommends \
@@ -24,6 +25,11 @@ COPY --from=build-image /usr/local/lib /usr/local/lib
 COPY --from=build-image /usr/local/bin/lnls-get-n-unpack /usr/local/bin/lnls-get-n-unpack
 RUN lnls-get-n-unpack -r $RUNTIME_TAR_PACKAGES && \
     ldconfig
+RUN if [ -n "$RUNTIME_PIP_PACKAGES" ]; then \
+        apt update && \
+        apt install -y --no-install-recommends pip && \
+        pip install $RUNTIME_PIP_PACKAGES; \
+    fi
 
 COPY --from=build-image /usr/local/bin/lnls-run /usr/local/bin/lnls-run
 
@@ -44,12 +50,18 @@ FROM build-image AS build-stage
 ARG REPONAME
 ARG BUILD_PACKAGES
 ARG BUILD_TAR_PACKAGES
+ARG BUILD_PIP_PACKAGES
 
 RUN if [ -n "$BUILD_PACKAGES" ]; then \
         apt update && \
         apt install -y --no-install-recommends $BUILD_PACKAGES; \
     fi
 RUN lnls-get-n-unpack -r $BUILD_TAR_PACKAGES
+RUN if [ -n "$BUILD_PIP_PACKAGES" ]; then \
+        apt update && \
+        apt install -y --no-install-recommends pip && \
+        pip install $BUILD_PIP_PACKAGES; \
+    fi
 
 WORKDIR /opt/${REPONAME}