Set pnpm env vars rather than reloading .zshrc

Reloading .zshrc is a little problematic for a few reasons:
1. user might be running bash or fish or something
2. there might be problematic commands in there, we don't want to take responsibility for running them

So instead we should just set the basic pnpm env vars if necessary and move on

gib.sh

@@ -32,18 +32,22 @@
     echo "Preparing pnpm..."
     curl -fsSL https://get.pnpm.io/install.sh | sh - >/dev/null
 
-    # automatically reload .zshrc if pnpm isn't already in the path
+    # ensure pnpm env vars are set
+    if [ -z "$PNPM_HOME" ]; then
+        export PNPM_HOME="$HOME/Library/pnpm"
+    fi
+
+    # ensure PATH contains pnpm home
+    case ":$PATH:" in
+        *":$PNPM_HOME:"*) ;;
+        *) export PATH="$PNPM_HOME:$PATH" ;;
+    esac
+
+    # check for pnpm command and ask user to reload terminal if not found
     if ! command -v pnpm >/dev/null; then
-        set +e # ignore errors in the .zshrc, we just need the path to be updated
-        source ~/.zshrc
-        set -e # re-enable exit on err
-
-        # if pnpm still not in path after reloading .zshrc, exit with error
-        if ! command -v pnpm >/dev/null; then
-            echo "pnpm command not found in PATH"
-            echo "Please reload your terminal, then run this script again"
-            exit 1
-        fi
+        echo "pnpm not found in PATH"
+        echo "Please reload your terminal, then run this script again"
+        exit 1
     fi
 
     # ensure node v20 is in use