Removed shell test

.github/workflows/shell.yml

@@ -1,22 +0,0 @@
-name: Shell
-
-on:
-  push:
-    paths-ignore:
-    - 'docs/**'
-    - '.github/workflows/**'
-    - '!.github/workflows/shell.yml'
-  pull_request:
-
-jobs:
-  build:
-    runs-on: ubuntu-18.04
-    container: docker://ubuntu:latest
-    steps:
-    - name: Update Package Manager
-      run: DEBIAN_FRONTEND=noninteractive && apt-get update && apt-get install -y tzdata
-    - name: Install dependencies
-      run: |
-        apt-get install -y net-tools iputils-ping
-    - name: Test connection
-      run: ping -c 4 8.8.8.8