Install zgen at interactive shell startup

config/zsh/.zshenv

@@ -1,8 +1,5 @@
 export ZGEN_DIR="$XDG_CACHE_HOME/zgen"
 export ZGEN_SOURCE="$ZGEN_DIR/zgen.zsh"
-if [[ ! -d "$ZGEN_DIR" ]]; then
-  git clone https://github.com/tarjoilija/zgen "$ZGEN_DIR"
-fi
 
 for dir in $XDG_CONFIG_HOME/*/bin(N); do
   export PATH="$dir:$PATH"

config/zsh/.zshrc

@@ -1,3 +1,6 @@
+if [[ ! -d "$ZGEN_DIR" ]]; then
+  git clone https://github.com/tarjoilija/zgen "$ZGEN_DIR"
+fi
 source $ZGEN_SOURCE
 
 if ! zgen saved; then