added optional branch/tag checkout feature

deploy.sh

@@ -16,8 +16,8 @@ if [ -f "${DEPLOY_DESTINATION_FILE}" ]; then
 fi
 
 # Check if the correct usage is respected
-if [ $# -ne 2 ]; then
-  echo "Usage: $0 <service> <service name>"
+if [ $# -le 2 ]; then
+  echo "Usage: $0 <service> <service name> [branch/tag]"
   echo
   echo "Current settings:"
   echo "- Source      · ${DEPLOY_SOURCE}"
@@ -27,3 +27,9 @@ fi
 
 echo "deploying ..."
 git clone "${DEPLOY_SOURCE}/${1}" "${DEPLOY_DESTINATION}/${2}"
+
+if [ $# -eq 3 ]; then
+  pushd "${DEPLOY_DESTINATION}/${2}"
+  git checkout "${3}"
+  popd
+fi