runner-images/images/linux/toolcache-1604.json

{
    "@actions/toolcache-python-ubuntu-1604-x64": [
        "2.7", "3.5", "3.6", "3.7", "3.8"
    ],
    "@actions/toolcache-ruby-ubuntu-1604-x64": [
        "2.4", "2.5", "2.6", "2.7"
    ],
    "@actions/toolcache-pypy-ubuntu-1604-x64": [
        "2", "3"
    ],
    "@actions/toolcache-boost-ubuntu-1604-x64": [
        "1.69", "1.72"
    ]
}