rebase wrt 0.6.6

Author: affeldt-aist

.github/workflows/docker-action.yml

@@ -15,11 +15,7 @@ jobs:
     strategy:
       matrix:
         image:
-          - 'mathcomp/mathcomp:1.15.0-coq-8.14'
-          - 'mathcomp/mathcomp:1.15.0-coq-8.15'
           - 'mathcomp/mathcomp:1.15.0-coq-8.16'
-          - 'mathcomp/mathcomp:1.16.0-coq-8.14'
-          - 'mathcomp/mathcomp:1.17.0-coq-8.15'
           - 'mathcomp/mathcomp:1.17.0-coq-8.16'
           - 'mathcomp/mathcomp:1.17.0-coq-8.17'
       fail-fast: false