versions.txt has been removed, fix tag to restore docker image builds

.travis.yml

@@ -12,6 +12,7 @@ before_install:
 - mkdir -p node_modules
 - cd $TRAVIS_BUILD_DIR
 - mkdir ../build
+- export TAG=$(git describe --abbrev=0 --tags)
 - export SANDSTORM_VERSION=$(curl -f "https://install.sandstorm.io/dev?from=0&type=install")
 - export PATH=$PATH:/tmp/sandstorm-$SANDSTORM_VERSION/bin
 - cd .sandstorm
@@ -19,7 +20,6 @@ before_install:
 script:
 - cd $TRAVIS_BUILD_DIR
 - if [[ "$TRAVIS_PULL_REQUEST" != "false" ]]; then echo "Building PR $TRAVIS_PULL_REQUEST"; meteor build ../build; exit $?; fi
-- export TAG=$(git describe --abbrev=0 --tags)
 - meteor build ../build
 - cp ../build/Rocket.Chat.tar.gz  /home/vagrant
 - cd .travis

.travis/builddocker.sh

+#!/bin/bash
+
+set -euo pipefail
+
+
 if [ -z ${TRAVIS_TAG+x} ];
-then "curl -H \"Content-Type: application/json\" --data \"{'source_type': 'Branch', 'source_name': \'$TRAVIS_BRANCH\', 'docker_tag': \'`cat ../../build/version.txt`\'}\" -X POST https://registry.hub.docker.com/u/rocketchat/rocket.chat/trigger/$PUSHTOKEN/";
-else "curl -H \"Content-Type: application/json\" --data \"{'source_type': 'Tag', 'source_name': \'$TRAVIS_TAG\', 'docker_tag': \'`cat ../../build/version.txt`\'}\" -X POST https://registry.hub.docker.com/u/rocketchat/rocket.chat/trigger/$PUSHTOKEN/";
+then "curl -H \"Content-Type: application/json\" --data \"{'source_type': 'Branch', 'source_name': \'$TRAVIS_BRANCH\', 'docker_tag': \'$TAG.$TRAVIS_BUILD_NUMBER.$TRAVIS_BRANCH\'}\" -X POST https://registry.hub.docker.com/u/rocketchat/rocket.chat/trigger/$PUSHTOKEN/";
+else "curl -H \"Content-Type: application/json\" --data \"{'source_type': 'Tag', 'source_name': \'$TRAVIS_TAG\', 'docker_tag': \'$TAG.$TRAVIS_BUILD_NUMBER.$TRAVIS_BRANCH\'}\" -X POST https://registry.hub.docker.com/u/rocketchat/rocket.chat/trigger/$PUSHTOKEN/";
 fi