build: ensure version before deployment

Author: antonydenyer

scripts/common.bash

@@ -13,6 +13,10 @@ github_clone() {
 }
 
 ensure_version() {
+    if [[ -z "$VERSION" ]]; then
+        VERSION="${TRAVIS_BRANCH//release\/}"
+    fi
+
     if [[ "$VERSION" = "" ]]; then
         echo "ERROR: Missing VERSION specify it using an env variable"
         exit 1