fix(docker-releases): trim leading v from image names (#1759)

Coordinating change for swagger-api/swagger-ui#4567.

Author: shockey

build-tools/deploy-docker-hub-tag.sh

@@ -2,7 +2,7 @@ if [ $DOCKER_HUB_USERNAME ]; then
   docker login --username=$DOCKER_HUB_USERNAME --password=$DOCKER_HUB_PASSWORD;
 
   if [ ! -z "$TRAVIS_TAG" ]; then
-    DOCKER_IMAGE_TAG=$TRAVIS_TAG;
+    DOCKER_IMAGE_TAG=${TRAVIS_TAG#?};
     docker build -t $DOCKER_IMAGE_NAME .;
     docker tag $DOCKER_IMAGE_NAME $DOCKER_IMAGE_NAME:$DOCKER_IMAGE_TAG;
     docker push $DOCKER_IMAGE_NAME:$DOCKER_IMAGE_TAG;