Play Framework

fix(build): ship the application skeleton's .gitignore and .gitattributes in the release zip

`play new` copies resources/application-skel as it finds it. In a release zip
the skeleton had no .gitignore and no .gitattributes: Ant leaves both out of
every fileset by default, once when `artifact` copies the tree and again
when `package` zips it. An application created from a downloaded
distribution therefore did not ignore certs/.env, which holds the secret
`play new` generates, nor build/, logs/ or precompiled/. Applications
created from a git checkout of the framework were not affected. The zips of
1.13.75 and 1.13.78 were checked and both lack the files.

`artifact` now copies the skeleton with the default excludes off, `package`
zips the staged directory the same way, and `package` fails when the zip it
wrote does not hold both files. The check reads the zip because the staged
directory had them while the zip did not.

Checked by running `play new` from the unpacked zip before and after: before,
no .gitignore and certs/.env listed by git; after, both files identical to
the repository's and certs/.env ignored. The check fails on the released
1.13.78 zip and passes on the rebuilt one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KDUoh3KhBpfjXn4rV6H356