Install docker runtime for macOS in ci workflow

Author: iabudiab

.github/workflows/ci.yml

@@ -35,6 +35,7 @@ jobs:
   build:
     name: Swift ${{ matrix.swift }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
+    continue-on-error: true
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
@@ -49,6 +50,14 @@ jobs:
         key: ${{ matrix.os }}-${{ matrix.swift }}-${{ hashFiles('**/Package.resolved') }}
         restore-keys: |
           ${{ matrix.os }}-${{ matrix.swift }}-
+    - name: Install runtime for macOS
+      continue-on-error: true
+      if: matrix.os == 'macos-10.15'
+      run: |
+        brew install docker-machine docker
+        sudo docker --version
+        VBoxManage --version
+        sysctl hw.physicalcpu hw.logicalcpu
     - name: Start minikube
       uses: medyagh/setup-minikube@latest
       id: minikube