feat(git): Templatize git config for per-host/user identity override

Convert private_dot_config/git/config to config.tmpl so that the
[user] name/email can be overridden per host/user via the existing
`configs` key in .chezmoidata/hosts*.yaml, falling back to the
default identity (Xavier Logerais / xavier@logerais.com) when no
override is defined.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

private_dot_config/git/config

@@ -1,47 +0,0 @@
-[core]
-	excludesfile = ~/.config/git/ignore
-	attributesfile = ~/.config/git/attributes
-	pager = delta
-
-[user]
-	name = Xavier Logerais
-	email = xavier@logerais.com
-
-[credential]
-	helper = cache
-
-[credential "https://gitea.logerais.com"]
-	helper = cache
-	helper = !tea login helper
-
-[credential "https://gitea.cloud.logerais.com"]
-	helper = cache
-	helper = !tea login helper
-
-[init]
-	defaultBranch = main
-
-[rerere]
-	enabled = 1
-
-[merge]
-	conflictstyle = diff3
-
-[page]
-	diff = delta
-	show = delta
-	log = delta
-	blame = delta
-	reflog = delta
-
-[delta]
-	navigate = true
-	side-by-side = true
-	dark = true
-	syntax-theme = Coldark-Dark
-
-[interactive]
-	diffFilter = delta --color-only
-
-[alias]
-  tree = !git ls-files | tree --fromfile -C

private_dot_config/git/config.tmpl

@@ -0,0 +1,64 @@
+{{- $hostname := output "hostname" | trim -}}
+{{- $username := .chezmoi.username -}}
+{{- $currentHost := index .hosts $hostname -}}
+{{- $currentUser := "" -}}
+{{- if $currentHost -}}
+  {{- if hasKey $currentHost.users $username -}}
+    {{- $currentUser = index $currentHost.users $username -}}
+  {{- end -}}
+{{- end -}}
+{{- $gitConfig := dict -}}
+{{- if and $currentUser (hasKey $currentUser "configs") -}}
+  {{- if hasKey $currentUser.configs "git" -}}
+    {{- $gitConfig = $currentUser.configs.git -}}
+  {{- end -}}
+{{- end -}}
+{{- $gitName := $gitConfig.name | default "Xavier Logerais" -}}
+{{- $gitEmail := $gitConfig.email | default "xavier@logerais.com" -}}
+[core]
+	excludesfile = ~/.config/git/ignore
+	attributesfile = ~/.config/git/attributes
+	pager = delta
+
+[user]
+	name = {{ $gitName }}
+	email = {{ $gitEmail }}
+
+[credential]
+	helper = cache
+
+[credential "https://gitea.logerais.com"]
+	helper = cache
+	helper = !tea login helper
+
+[credential "https://gitea.cloud.logerais.com"]
+	helper = cache
+	helper = !tea login helper
+
+[init]
+	defaultBranch = main
+
+[rerere]
+	enabled = 1
+
+[merge]
+	conflictstyle = diff3
+
+[page]
+	diff = delta
+	show = delta
+	log = delta
+	blame = delta
+	reflog = delta
+
+[delta]
+	navigate = true
+	side-by-side = true
+	dark = true
+	syntax-theme = Coldark-Dark
+
+[interactive]
+	diffFilter = delta --color-only
+
+[alias]
+  tree = !git ls-files | tree --fromfile -C