add homebrew preinstall script

.chezmoidata/packages.yaml

@@ -0,0 +1,16 @@
+packages:
+  darwin:
+    brews:
+    - 'chozmoi'
+    - 'git'
+    - 'vim'
+    - 'lsix'
+    - 'eza'
+    - 'grc'
+    - 'cmake'
+    - 'python'
+    - 'go'
+    - 'nodejs'
+    - 'java'
+    casks:
+    - 'iterm2'

run_onchange_darwin-install-packages.sh.tmpl

@@ -0,0 +1,16 @@
+{{ if eq .chezmoi.os "darwin" -}}
+#!/bin/bash
+
+# Install Homebrew
+command -v brew >/dev/null 2>&1 || \
+  (echo '🍺  Installing Homebrew' && /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)")
+
+brew bundle --file=/dev/stdin <<EOF
+{{ range .packages.darwin.brews -}}
+brew {{ . | quote }}
+{{ end -}}
+{{ range .packages.darwin.casks -}}
+cask {{ . | quote }}
+{{ end -}}
+EOF
+{{ end -}}