runner-images/images/linux/toolcache-1804.json

{
    "@actions/toolcache-ruby-ubuntu-1804-x64": [
        "2.4", "2.5", "2.6", "2.7"
    ],
    "@actions/toolcache-boost-ubuntu-1804-x64": [
        "1.69", "1.72"
    ]
}