Allow to install extra projects from source

It may be required to install additional python packages from source.
To do this download them into loci/data directory and specify names of
projects via EXTRA_PROJECTS argument during build.

Change-Id: Iadf9a14aa0aa9082abb4ba015b08d2e37a20f521

Dockerfile

@@ -7,6 +7,7 @@ ARG WHEELS=loci/requirements:master-ubuntu_jammy
 ARG PROJECT_REPO=https://opendev.org/openstack/${PROJECT}
 ARG PROJECT_REF=master
 ARG PROJECT_RELEASE=master
+ARG EXTRA_PROJECTS=""
 ARG DISTRO=""
 ARG PROFILES=""
 ARG PIP_PACKAGES=""

README.md

@@ -105,6 +105,7 @@ For more advanced building you can use docker build arguments to define:
   * `REGISTRY_INSECURE` Set this to `True` if your image registry is
     running on HTTPS with self-signed certificates to ignore SSL verification.
     (defaults to False)
+  * `EXTRA_PROJECTS` extra projects to install from `loci/data` directory.
 
 This makes it really easy to integrate LOCI images into your development or
 CI/CD workflow, for example, if you wanted to build an image from [this

scripts/install.sh

@@ -94,7 +94,13 @@ fi
 
 $(dirname $0)/clone_project.sh
 $(dirname $0)/install_packages.sh
-$(dirname $0)/pip_install.sh ${NO_INDEX} /tmp/${PROJECT} ${PIP_PACKAGES}
+
+extra_projects_path=""
+for pr in $EXTRA_PROJECTS; do
+  extra_projects_path="$extra_projects_path /tmp/${pr}"
+done
+
+$(dirname $0)/pip_install.sh ${NO_INDEX} /tmp/${PROJECT} ${extra_projects_path} ${PIP_PACKAGES}
 for project_script in $(ls $(dirname $0)/project_specific/${PROJECT}); do
     echo "Running $PROJECT specific script $project_script"
     $(dirname $0)/project_specific/${PROJECT}/$project_script