Dev/install issues #767 #769 (#778)

* add libxcrypt install instructions #767
* update dependencies in env files, #769
* update github workflow test-build-from-source #767
* add note re build env deps
* Revert "update dependencies in env files, #769"

This reverts commit ddb5b17.

---------

Co-authored-by: Roland Stevenson <rolandrmgservices@gmail.com>

.github/workflows/test-build-from-source.yml

@@ -55,6 +55,7 @@ jobs:
           conda install -c conda-forge cxx-compiler
           conda install python-graphviz
           conda install -c conda-forge xorg-libxrender
+          conda install -c conda-forge libxcrypt
 
       - name: echo conda config
         run: |

docs/installation.rst

@@ -34,6 +34,8 @@ Install from the ``conda`` virtual environment
 
 This will create a new ``conda`` virtual environment named ``causalml-[tf-]py3x``, where ``x`` is in ``[7, 8, 9]``. e.g. ``causalml-py37`` or ``causalml-tf-py38``. If you want to change the name of the environment, update the relevant YAML file in ``envs/``.
 
+Note: if you do not have the base cxx-compiler libraries installed, follow the ``Install from source`` instructions below to install them first.
+
 .. code-block:: bash
 
     git clone https://github.com/uber/causalml.git
@@ -80,6 +82,7 @@ Create a clean ``conda`` environment.
     conda install -c conda-forge cxx-compiler
     conda install python-graphviz
     conda install -c conda-forge xorg-libxrender
+    conda install -c conda-forge libxcrypt
 
 Then: