Fix build

buildSrc/.gitignore

@@ -0,0 +1 @@
+!src/main/java/io/freefair/gradle/plugins/build

buildSrc/src/main/java/io/freefair/gradle/plugins/build/ListPluginIds.java

@@ -0,0 +1,42 @@
+package io.freefair.gradle.plugins.build;
+
+import org.gradle.api.DefaultTask;
+import org.gradle.api.Project;
+import org.gradle.api.file.RegularFileProperty;
+import org.gradle.api.tasks.CacheableTask;
+import org.gradle.api.tasks.OutputFile;
+import org.gradle.api.tasks.TaskAction;
+import org.gradle.plugin.devel.GradlePluginDevelopmentExtension;
+import org.gradle.plugin.devel.PluginDeclaration;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.util.ArrayList;
+import java.util.List;
+
+
+public abstract class ListPluginIds extends DefaultTask {
+
+    @OutputFile
+    public abstract RegularFileProperty getOutputFile();
+
+    @TaskAction
+    public void listIds() throws IOException {
+        List<String> ids = new ArrayList<>();
+
+        for (Project subproject : getProject().getRootProject().getAllprojects()) {
+
+            GradlePluginDevelopmentExtension extension = subproject.getExtensions().findByType(GradlePluginDevelopmentExtension.class);
+
+            if (extension != null) {
+                for (PluginDeclaration plugin : extension.getPlugins()) {
+                    ids.add(plugin.getId());
+                }
+            }
+        }
+
+        Files.write(getOutputFile().get().getAsFile().toPath(), ids, StandardCharsets.UTF_8);
+    }
+}