Add SonarQube alpine-based builds, and make them the default

library/sonarqube

@@ -2,10 +2,16 @@ Maintainers: Janos Gyerik <[email protected]> (@janos-ss),
              Julien Lancelot <[email protected]> (@julienlancelot),
              Christophe Levis <[email protected]> (@christophelevis)
 GitRepo: https://github.com/SonarSource/docker-sonarqube.git
-GitCommit: cbc60794178859a867d572d3a5d386f38df87333
+GitCommit: b3cb018a78ad7879bf1e07e2516f1497eb15a0c2
 
-Tags: 6.7.6-community, 6.7-community, lts
+Tags: 6.7.6-community-alpine, 6.7-community-alpine, lts
+Directory: 6.7.6-community-alpine
+
+Tags: 6.7.6-community, 6.7-community
 Directory: 6.7.6-community
 
-Tags: 7.4-community, latest
+Tags: 7.4-community-alpine, latest
+Directory: 7.4-community-alpine
+
+Tags: 7.4-community
 Directory: 7.4-community