If the build system for packages has a umask of `0077`, cloned
repositories will have no permissions for group and other. As the build
scripts for some packages just copy from clone git repos, this will
preserve the permissions in the package and prevent the following
services from startup:
* `bbb-html5`
* `etherpad`
* `bbb-pads`
* `bbb-export-annotations`
* `bbb-rap-*`
This patch grants everyone read permissions to the code in the packages.
yq package is now provided in the BigBlueButton support PPA for BBB 2.5,
so we can depend on the package now. Ensure the dependency is specific
to avoid an incompatible yq version 4 from being installed.
Now uses Ubuntu's bundler version to install all dependencies at build time
rather than install time. Gems are also now vendored, and no longer pollute the
operating system.
