Added a new script for running drush cache clears which could be easi…

…ly repurposed as a stub for any drush command.

samples/drush-cache-clear.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+#
+# A sample cloud hook to run a Drush Cache Clear.
+# 
+
+# Map the script inputs to convient names.
+site=$1                       # The site name. This is the same as the Acquia Cloud username for the site.
+targetenv=$2                  # The environment to which code was just deployed.
+sourcebranch=$3               # The code branch or tag being deployed.  
+deployedtag=$4                # The code branch or tag being deployed. 
+repourl=$5                    # The URL of your code repository.
+repotype=$6                   # The version control system your site is using; "git" or "svn".
+drushalias=$site'.'$targetenv # The drush alias for the site and environment. (This makes the assumption that the alias is always a combination of site name and environment.)
+
+# Setup some environment variables that aren't available normally in CLI mode but could be used in settings files.
+export AH_SITE_NAME=$drushalias
+export AH_SITE_GROUP=$site
+export AH_SITE_ENVIRONMENT=$targetenv
+
+export AH_NON_PRODUCTION=1
+if [ $targetenv = 'prod' ] 
+  then
+    export AH_NON_PRODUCTION=0
+fi
+
+# Execute a standard drush command.
+/usr/local/bin/drush @$drushalias cc all
+