SonarQube: add tag `lts-alpine`

library/sonarqube

@@ -4,4 +4,5 @@
 latest: git://github.com/SonarSource/docker-sonarqube@a0b588131c7729c8156936a4521740228fe682c6 5.6
 lts: git://github.com/SonarSource/docker-sonarqube@a0b588131c7729c8156936a4521740228fe682c6 5.6
 5.6: git://github.com/SonarSource/docker-sonarqube@a0b588131c7729c8156936a4521740228fe682c6 5.6
+lts-alpine: git://github.com/SonarSource/docker-sonarqube@a0b588131c7729c8156936a4521740228fe682c6 5.6-alpine
 5.6-alpine: git://github.com/SonarSource/docker-sonarqube@a0b588131c7729c8156936a4521740228fe682c6 5.6-alpine