fix: ensure Arch’s install always works

Upon machine creation, `pacman` cannot install software without an
initial `pacman --refresh --sync` (or `pacman -yS`, but referred to in
Arch documentation as `pacman -Sy`).

This change adds the missing `--refresh`/`-y` to the `pacman` call used
by the `install` alias.

Signed-off-by: Lucas Larson <[email protected]>

setup

@@ -15,7 +15,7 @@
 if command -v -- apk >/dev/null 2>&1; then
   alias install='command apk add --verbose'
 elif command -v -- pacman >/dev/null 2>&1; then
-  alias install='command pacman --noconfirm --sync --verbose'
+  alias install='command pacman --noconfirm --refresh --sync --verbose'
 elif command -v -- apt-get >/dev/null 2>&1; then
   alias install='command apt-get install --assume-yes --show-progress'
 fi