Publish BOM for alpha artifacts. (#2669)

bom-alpha/build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+    id("java-platform")
+    id("maven-publish")
+}
+
+description = "OpenTelemetry Bill of Materials (Alpha)"
+group = "io.opentelemetry"
+base.archivesBaseName = "opentelemetry-bom-alpha"
+
+rootProject.subprojects.forEach { subproject ->
+    if (!project.name.startsWith("bom")) {
+        evaluationDependsOn(subproject.path)
+    }
+}
+
+afterEvaluate {
+    dependencies {
+        constraints {
+            rootProject.subprojects
+                    .sortedBy { it.findProperty("archivesBaseName") as String? }
+                    .filter { !it.name.startsWith("bom") }
+                    .filter { it.findProperty("otel.release") == "alpha" }
+                    .forEach { project ->
+                        project.plugins.withId("maven-publish") {
+                            api(project)
+                        }
+                    }
+        }
+    }
+}

bom-alpha/gradle.properties

@@ -0,0 +1 @@
+otel.release=alpha

bom/build.gradle.kts

@@ -18,7 +18,7 @@ afterEvaluate {
         constraints {
             rootProject.subprojects
                     .sortedBy { it.findProperty("archivesBaseName") as String? }
-                    .filter { it.name != project.name }
+                    .filter { !it.name.startsWith("bom")}
                     .filter { !it.hasProperty("otel.release") }
                     .forEach { project ->
                         project.plugins.withId("maven-publish") {

settings.gradle

@@ -41,6 +41,7 @@ include ":all",
         ":api:metrics",
         ":semconv",
         ":bom",
+        ":bom-alpha",
         ":dependencyManagement",
         ":extensions:annotations",
         ":extensions:kotlin",