Find update steps and execute them with bootstrap context

scm-webapp/src/main/java/sonia/scm/MigrationEngine.java

@@ -0,0 +1,20 @@
+package sonia.scm;
+
+import sonia.scm.migration.UpdateStep;
+
+import javax.inject.Inject;
+import java.util.Set;
+
+public class MigrationEngine {
+
+  private final Set<UpdateStep> steps;
+
+  @Inject
+  public MigrationEngine(Set<UpdateStep> steps) {
+    this.steps = steps;
+  }
+
+  public void migrate() {
+    steps.forEach(UpdateStep::doUpdate);
+  }
+}