add default tag (#1)

Reviewed-on: #1

check.sh

@@ -28,18 +28,23 @@ fi
 echo "${BASE}" | grep -q "/" || BASE="library/${BASE}"
 echo "${TARGET}" | grep -q "/" || TARGET="library/${TARGET}" 
 
+# if no tag is give default to latest
+echo "${BASE}" | grep -q ":" || BASE="${BASE}:latest"
+echo "${TARGET}" | grep -q ":" || TARGET="${TARGET}:latest" 
 
-# move tha tag to its own var and remove it from the repo name
+
+# move the tag to its own var and remove it from the repo name
 BASE_TAG=$(echo "${BASE}" | sed 's/[^:]*://')
 TARGET_TAG=$(echo "${TARGET}" | sed 's/[^:]*://')
 
 BASE_REPO=$(echo "${BASE}" | sed 's/:.*//')
 TARGET_REPO=$(echo "${TARGET}" | sed 's/:.*//') 
 
+
+# build the url to the repo
 BASE_URL="https://hub.docker.com/v2/repositories/${BASE_REPO}/tags/${BASE_TAG}"
 TARGET_URL="https://hub.docker.com/v2/repositories/${TARGET_REPO}/tags/${TARGET_TAG}"
 
-
 # login if credentias are passed
 HEADER=""
 if [ -n "${DOCKER_USERNAME}" ] && [ -n "${DOCKER_PASSWORD}" ]; then