Revert "ci: no longer require real name"

Revert "ci: no longer require real name"

It was decided that we should require to use real name once again.
There was discussion about it on the mailing list [1], which
was based on the commit in different OpenWrt repo [2]

This reverts commit 7e6cd98ad481184b1a620a9862aa3713d1ab85cc.

[1] https://lists.openwrt.org/pipermail/openwrt-devel/2024-April/042711.html
[2] https://github.com/openwrt/actions-shared-workflows/commit/12d9551f2d07ec34ac813da8612c8014fb393af6

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>