Upgraded to Ruby 2.7

Changelog for 0.4.0:

• PR #14 Update ruby version to 2.7.2 by @blijblijblij
• PR #12 Sinatra headers only accept string hash keys by @koffeinfrei
• PR #8 Add the repo to the template pull command by @koffeinfrei
• PR #9 Add optional response status by @koffeinfrei

Commits
e730d69 Update of-watchdog to 0.8.1 by @blijblijblij
676e4a2 Bump ruby container to 2.7.2-slim-buster by @blijblijblij
c863232 sinatra headers only accept string hash keys by @koffeinfrei
5be7639 Add the repo to the template pull command by @koffeinfrei
5d193e6 add optional response status by @koffeinfrei
16d5e9b Actually set headers in sinatra routes by @koffeinfrei
743b274 Update watchdog by @alexellis
4aff81f Bump to new watchdog by @alexellis
e583be5 Add build-essentials by @alexellis

Generated by Derek

Move to Ruby 2.6.3 and Debian

This change updates Ruby and makes native packages such as
nokogiri very simple to build and consume.

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

Version with multi-arch watchdog

Update to multi-arch image

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

Initial version

Initial version of Ruby template ported to of-watchdog

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>