ci: rm ubuntu 18 test

Author: jaydesl

.github/workflows/main.yml

@@ -24,23 +24,6 @@ jobs:
           edge.yml
           worker.yml
 
-  play-ubuntu-18:
-    runs-on: ubuntu-18.04
-    needs: lint
-    steps:
-    - uses: actions/checkout@v2
-    - name: Remove existing K8s installations
-      run: sudo apt auto-remove kubectl ansible containernetworking-plugins -y
-    - name: Install Ansiblev2.9
-      run: sudo apt install python3-setuptools && sudo pip3 install ansible==2.9
-    - name: Replace hosts file
-      run: sudo cp ./tests/hosts.yml ./playbook/inventory/hosts.yml
-    - name: Run MiCADO Playbook
-      uses: dawidd6/action-ansible-playbook@v2
-      with:
-        directory: ./playbook/
-        playbook: project/micado.yml
-
   play-ubuntu-20:
     runs-on: ubuntu-20.04
     needs: lint