Add toplevel :sqlPostCommit gradle command

build.gradle

@@ -204,6 +204,9 @@ task javaPreCommitPortabilityApi() {
 task javaPostCommit() {
   dependsOn ":beam-runners-google-cloud-dataflow-java:postCommit"
   dependsOn ":beam-sdks-java-io-google-cloud-platform:postCommit"
+}
+
+task sqlPostCommit() {
   dependsOn ":beam-sdks-java-extensions-sql:postCommit"
   dependsOn ":beam-sdks-java-extensions-sql-jdbc:postCommit"
 }