Use correct docker version in main.yml

.github/workflows/main.yml

@@ -30,9 +30,8 @@ jobs:
     - name: Install Latest Docker
       run: |
           curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
-          sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu  $(lsb_release -cs)  stable"
-          sudo apt-get update
-          sudo apt-get install docker-ce=20.10~ce~3-0~ubuntu
+          sudo apt-add-repository "deb https://apt.dockerproject.org/repo ubuntu-$(lsb_release -cs) main"        
+          sudo apt-get update -y && apt-get install docker-ce=18.06.2~ce~3-0~ubuntu
     - name: Check Docker Version
       run: docker --version