Centos 8 build instructions (#263)

Summary: Pull Request resolved: #263

Test Plan:
Build:
{P550129352}
and test:
{P550158647}

Reviewed By: PaliC

Differential Revision: D41169820

Pulled By: teknoraver

fbshipit-source-id: 78b6d198ef8878d6882755f55a64cfa1e8dcc238

Author: teknoraver

.github/workflows/install_test.yaml

@@ -35,7 +35,7 @@ jobs:
         run: |
           set -eux
           sudo apt update
-          xargs sudo apt install -y -qq --no-install-recommends <build-requirements.txt
+          xargs sudo apt install -y -qq --no-install-recommends <build-requirements-debian.txt
           git submodule update --init --recursive --jobs 0
 
       - name: Update cmake

README.md

@@ -58,11 +58,17 @@ git submodule sync && git submodule update --init --recursive
 
 #### Installing System Dependencies
 
-The runtime system dependencies are specified in `build-requirements.txt`. To install them on Debian-based systems, one could run:
+The runtime system dependencies are specified in `build-requirements-{debian,centos8}.txt`.
+To install them on Debian-based systems, one could run:
 
 ```shell
 sudo apt update
-xargs sudo apt install -y -qq --no-install-recommends <build-requirements.txt
+xargs sudo apt install -y -qq --no-install-recommends <build-requirements-debian.txt
+```
+
+While on a Centos system:
+```shell
+xargs sudo dnf install -y <build-requirements-centos8.txt
 ```
 
 #### Python Environment Setup

build-requirements-centos8.txt

@@ -0,0 +1,4 @@
+libffi-devel
+libnsl2-devel
+readline-devel
+xz-devel

build-requirements.txt renamed to build-requirements-debian.txt

@@ -40,14 +40,19 @@ First clone multipy and update the submodules:
 Installing system dependencies
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-The runtime system dependencies are specified in
-``build-requirements.txt``. To install them on Debian-based systems, one
-could run:
+The runtime system dependencies are specified in ``build-requirements-{debian,centos8}.txt``.
+To install them on Debian-based systems, one could run:
 
 .. code:: shell
 
    sudo apt update
-   xargs sudo apt install -y -qq --no-install-recommends < build-requirements.txt
+   xargs sudo apt install -y -qq --no-install-recommends < build-requirements-debian.txt
+
+While to install on a CentOS 8 system:
+
+.. code:: shell
+
+   xargs sudo dnf install -y < build-requirements-centos8.txt
 
 Installing environment encapsulators
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~