echo username and details of .env file for debugging ci failures.

[naemono]

Currently building nightly releases is failing with:

16:31:26  + .ci/setenvconfig build
16:31:26  .ci/setenvconfig: line 16: .ci/../.env: Permission denied
16:31:26  [Pipeline] }
16:31:26  [Pipeline] // script
16:31:26  Error when executing success post condition:

This seems to indicate that writing/updating the .env file is failing, as if it was written by either

1. a different user
2. or with permissions that aren't allowing u+w

This change will at least help debug the issue, but not solve it.

[naemono]

Going to merge this without approval, as it can't make the failures any worse, and can only help debugging the issue. To be immediately removed upon resolution of current issues.