[PR PATCH] git-cliff: generate and ship man page

[jcgruenhage <jcgruenhage@users.noreply.github.com>]

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There is a new pull request by jcgruenhage against master on the void-packages repository

https://github.com/jcgruenhage/void-packages git-cliff-0.9.0_2
https://github.com/void-linux/void-packages/pull/39344

git-cliff: generate and ship man page
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Motivation here is that running `git cliff --help` doesn't give any reasonable
output (just complains that there is man page on `git-cliff`), while `git-cliff
--help` does. The former is handled by git, which opens `man 1 git-cliff`,
where as the latter is handled by `git-cliff`, giving out the default help
output from clap.

With this change, `git cliff --help` and `git-cliff --help` still differ, but
at least they both give out a sensible result.

#### Testing the changes
- I tested the changes in this PR: **YES**

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A patch file from https://github.com/void-linux/void-packages/pull/39344.patch is attached

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From 6ca72dadd684461223de4cc173398f31115b75e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Christian=20Gr=C3=BCnhage?=
 <jan.christian@gruenhage.xyz>
Date: Sun, 18 Sep 2022 17:39:26 +0200
Subject: [PATCH] git-cliff: generate and ship man page

---
 srcpkgs/git-cliff/template | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/srcpkgs/git-cliff/template b/srcpkgs/git-cliff/template
index b22c7a1a7428..03e99e136092 100644
--- a/srcpkgs/git-cliff/template
+++ b/srcpkgs/git-cliff/template
@@ -1,7 +1,7 @@
 # Template file for 'git-cliff'
 pkgname=git-cliff
 version=0.9.0
-revision=1
+revision=2
 archs="x86_64* i686* aarch64* arm*" # ring
 build_style=cargo
 build_helper=qemu
@@ -23,4 +23,7 @@ post_install() {
 	vcompletion "_git-cliff" zsh
 	vcompletion "git-cliff.fish" fish
 	vcompletion "git-cliff.bash" bash
+
+	OUT_DIR=${PWD} vtargetrun ${DESTDIR}/usr/bin/git-cliff-mangen
+	vman git-cliff.1
 }