Add cloud-bom (#282)

cloud-bom/build.gradle.kts

@@ -0,0 +1,25 @@
+plugins {
+    `java-platform`
+}
+
+indra {
+    configurePublications {
+        from(components["javaPlatform"])
+    }
+}
+
+dependencies {
+    constraints {
+        for (subproject in rootProject.subprojects) {
+            if (subproject == project) { // the bom itself
+                continue
+            }
+
+            if (subproject.name.startsWith("example-")) {
+                continue
+            }
+
+            api(project(subproject.path))
+        }
+    }
+}