Rename grootfs-gh-release to grootfs-github-release
Rename grootfs-gh-release to grootfs-github-release

[#149144593]

Signed-off-by: Gareth Clay <8aba8f4b00339badb90ac755871f48a24e433180@pivotal.io>

masters-of-cats/grootfs-release,masters-of-cats/grootfs-release