limit parallel test execution

Author: shoriminimoe

.github/workflows/integ-test.yml

@@ -162,6 +162,7 @@ jobs:
       run:
         working-directory: ${{ env.WORKDIR }}
     strategy:
+      max-parallel: 1
       fail-fast: false
       matrix:
         ansible: [ 2.15.0 ]
@@ -208,6 +209,7 @@ jobs:
       run:
         working-directory: ${{ env.WORKDIR }}
     strategy:
+      max-parallel: 1
       fail-fast: false
       matrix:
         # ansible: [2.15.0]