Use php-darwin caches on macOS

src/scripts/darwin.sh

@@ -174,6 +174,12 @@ get_brewed_php() {
   fi
 }
 
+# Function to setup PHP from the cached builds.
+setup_cached_versions() {
+  latest="releases/download/php-$version" run_script \
+    "php-darwin" "$version" "${debug:?}" "${ts:?}" >/dev/null 2>&1
+}
+
 # Function to setup PHP 5.6 and newer using Homebrew.
 add_php() {
   action=$1
@@ -182,6 +188,9 @@ add_php() {
   php_keg="php@$version$suffix"
   php_formula="shivammathur/php/$php_keg"
   if [[ "$existing_version" = "false" || -n "$suffix" || "$action" = "upgrade" ]]; then
+    if [ "${runner:?}" != "self-hosted" ] && [ "${use_package_cache:-true}" != "false" ] && setup_cached_versions; then
+      return 0
+    fi
     update_dependencies
     add_brew_tap "$php_tap"
   fi
@@ -252,7 +261,7 @@ setup_php() {
   if [[ "$version" =~ ${old_versions:?} ]]; then
     run_script "php5-darwin" "${version/./}" >/dev/null 2>&1
     status="Installed"
-  elif [ "${existing_version:0:3}" != "$version" ]; then
+  elif [[ "${existing_version:0:3}" != "$version" || -n "$(get_php_formula_suffix)" ]]; then
     add_php "install" "$existing_version" >/dev/null 2>&1
     status="Installed"
   elif [[ "${existing_version:0:3}" = "$version" && "${update:?}" = "true" ]]; then