Update jsng-ci.yml to use multiple ubuntu versions (#536)

* Update jsng-ci.yml to use multiple ubuntu versions

running ci workflow on Ubuntu 20.0, Ubuntu 18.04 and Ubuntu 16.04

* Update jsng-ci.yml remove ubuntu 16.04

* Update jsng-ci.yml

- including additional values into combinations
- Prevents a workflow run from failing when a job fails only for experimental jobs with both ubuntu 20.04 and python 3.9
- prevent GitHub cancels all in-progress jobs if any matrix job fails. to allow us to know the results for all jobs, even if one fails.
- maximize the number of jobs that can run simultaneously when using a matrix job strategy.

* fix for Unexpected value '' evaluating 'runs-on'

* Update jsng-ci.yml

* fix -hopefully- err when evaluating 'runs-on'

* Update jsng-ci.yml

* Update jsng-ci.yml

adding names to experimental jobs.

* changes to jobs names

* Adding net-tools utilities to deps in CI workflow

netstat not available in recent Ubuntu versions. it is not installed by default and considered deprecated in favor of the modern ss command.
as some tests used netstat, this commit bing it back by installing net-tools utilities

Author: sameh-farouk

.github/workflows/jsng-ci.yml

@@ -11,10 +11,24 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.experimental }}
     strategy:
+      fail-fast: false
+      # max-parallel: 9
       matrix:
+        os: [ubuntu-18.04]
         python-version: [3.6, 3.7, 3.8]
+        experimental: [false]
+        include:
+          - os: ubuntu-20.04
+            python-version: 3.8
+            experimental: true
+            name: Experimental build - latest Ubuntu
+          - python-version: 3.9
+            os: ubuntu-18.04
+            experimental: true
+            name: Experimental build - latest Python
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
@@ -24,7 +38,7 @@ jobs:
       - name: Gathering deps
         run: |
           sudo apt-get update
-          sudo apt-get install -y git python3-setuptools tmux redis
+          sudo apt-get install -y git python3-setuptools tmux redis net-tools
           sudo pip3 install poetry
       - name: Install
         run: |