[PATCH v5 0/1] ref-filter: add new "signature" atom

This patch addresses Junio's comment here<https://public-inbox.org/git/xmqqmt65atu1.fsf@gitster.g/>. I introduced an integer flag called signature_checked to cater for this.

Also, the fact that "test bare signature atom" test was failing on different machines(CI on github) due to trustdb, I introduced a hack to cater for this.Something like this, `grep -v "checking the trustdb" out_orig >out &&`

Nsengiyumva Wilberforce (1):
  ref-filter: add new "signature" atom

 Documentation/git-for-each-ref.txt |  27 ++++++
 ref-filter.c                       | 106 ++++++++++++++++++++++++
 t/t6300-for-each-ref.sh            | 128 +++++++++++++++++++++++++++++
 3 files changed, 261 insertions(+)

Range-diff against v4: 1: d9ce65f411 = 1: d9ce65f411 ref-filter: add new "signature" atom