Currently, two "demo" and "example" bridges are excluded from GitHub's
autogenerated tarballs. As I argued, those files can still be helpful
for integration tests, as they are run in NixOS and don't need internet
access or depend on the availability of external services [1].
Additionally, the official docker image builds from the checkout so it
includes those bridges when users use containers or a git checkout
compared to tarballs. This commit therefore unifies the list of
available bridges between deployment methods.
[1] https://github.com/NixOS/nixpkgs/blob/master/nixos/tests/web-apps/rss-bridge.nix#L20
Heroku requires the file `app.json` as well as the composer files
`composer.json` and `composer.lock` to deploy a service. Deploy
doesn't work if these files are ignored during export (because of
the way this service deploys projects).
This commit adds comments to .gitattributes to prevent this issue
from re-appearing in the future. All affected lines are commented
out.
Also added some spacing for better readability.
References #1165
Files with the option "export-ignore" are excluded from "git archive"
commands. Release files from GitHub will also ignore those files, so
packages are smaller and don't include unneccessary files.
