Add some zig specific excludes and envvars

dotfiles/config/bashum/main.bashrc

     grep --color -n \
         --exclude-dir 'utils' \
         --exclude-dir '.git' \
+        --exclude-dir '.zig-cache' \
         -o '#[F]IXME:.*' -R "$@"
 }
 
     # Number one tool for refactoring!
     #
     local p=$1; shift
-    grep --color -n --exclude-dir=".git" -e "$p" -R "$@"
+    grep --color -n --exclude-dir=".git" --exclude-dir ".zig-cache" --exclude-dir "zig-out" -e "$p" -R "$@"
 }
 
 grepr1() {
 # get rid of those .pyc files once and for all
 export PYTHONDONTWRITEBYTECODE=1
 
+export ZIG_LOCAL_CACHE_DIR="$HOME/.cache/zig-local"
 export ZK_ROOT="$HOME/.local/pim/zk"
 export ZKZIG_ROOT="$HOME/.local/pim/zk"