use brew everywhere

zsh/zshrc

@@ -61,8 +61,13 @@ fi
 if [ "$(uname)" = "Darwin" ]; then
     # set up iterm integration
     [[ -f ~/.iterm2_shell_integration.zsh ]] && source ~/.iterm2_shell_integration.zsh
-    # source homebrew
+fi
+
+# Homebrew (macOS: /opt/homebrew, Linux: /home/linuxbrew/.linuxbrew)
+if [[ -x /opt/homebrew/bin/brew ]]; then
     eval "$(/opt/homebrew/bin/brew shellenv)"
+elif [[ -x /home/linuxbrew/.linuxbrew/bin/brew ]]; then
+    eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
 fi
 
 # Plugins (cloned into ~/.zsh/plugins by setup.sh)