Add info on focal

Author: myoung34

README.md

@@ -12,6 +12,7 @@ This will run the [new self-hosted github actions runners](https://help.github.c
 | ubuntu eoan | `x86_64`,`armv7`,`arm64` | `/\d\.\d{3}\.\d+/` | [latest](https://hub.docker.com/r/myoung34/github-runner/tags?page=1&name=latest) | This is the latest build (Rebuilt nightly and on master merges). Tags without an OS name are included. |
 | ubuntu bionic | `x86_64`,`armv7`,`arm64` | `/\d\.\d{3}\.\d+-ubuntu-bionic/` | [ubuntu-bionic](https://hub.docker.com/r/myoung34/github-runner/tags?page=1&name=ubuntu-bionic) | This is the latest build from bionic (Rebuilt nightly and on master merges). Tags with `-ubuntu-bionic` are included and created on [upstream tags](https://github.com/actions/runner/tags). | 
 | ubuntu xenial | `x86_64`,`armv7`,`arm64` |  `/\d\.\d{3}\.\d+-ubuntu-xenial/` | [ubuntu-xenial](https://hub.docker.com/r/myoung34/github-runner/tags?page=1&name=ubuntu-xenial) | This is the latest build from xenial (Rebuilt nightly and on master merges). Tags with `-ubuntu-xenial` are included and created on [upstream tags](https://github.com/actions/runner/tags). |
+| ubuntu focal | `x86_64`,`arm64` |  `/\d\.\d{3}\.\d+-ubuntu-focal/` | [ubuntu-focal](https://hub.docker.com/r/myoung34/github-runner/tags?page=1&name=ubuntu-focal) | This is the latest build from focal (Rebuilt nightly and on master merges). Tags with `-ubuntu-focal` are included and created on [upstream tags](https://github.com/actions/runner/tags). |
 
 These containers are built via Github actions that [copy the dockerfile](https://github.com/myoung34/docker-github-actions-runner/blob/master/.github/workflows/deploy.yml#L47), changing the `FROM` and building to provide simplicity.