Add HOMEBREW_PREFIX and _CELLAR env vars to brew caller

modules/04-install-brew.sh

@@ -158,6 +158,8 @@ function createBrewCallerScript() {
 					"HOMEBREW_LOGS=${homebrew_log}",
 					format_env("HOME", "%s"),
 					format_env("HOMEBREW_CASK_OPTS", "--no-quarantine %s"),
+					"HOMEBREW_PREFIX=${homebrewRepositoryPath}",
+					"HOMEBREW_CELLAR=${homebrewRepositoryPath}/Cellar",
 					"HOMEBREW_NO_AUTO_UPDATE=1",
 					"HOMEBREW_NO_ANALYTICS=1",
 					"HOMEBREW_NO_ANALYTICS_THIS_RUN=1",