Centos docker version of v1912 doesn't has foamyQuadMesh and foamyHexMesh tool.
By check the folder /opt/OpenFOAM/OpenFOAM-v1912/platforms/linux64GccDPInt32Opt/bin/, I find that this folder doesn't contain foamyHexMesh and foamyQuadMesh so that if one using these commands, he would encounter "command not found".
However in windows 10 ubuntu version, one wouldn't have this problem.