build: Use -notimestamp option for javadoc for reproducibility

Signed-off-by: BJ Hargrave <bj@hargrave.dev>

biz.aQute.repository/src/aQute/bnd/repository/maven/provider/Tool.java

@@ -86,6 +86,7 @@ public Jar doJavadoc(Map<String, String> options, boolean exportsOnly) throws Ex
 
 		try (PrintWriter writer = IO.writer(javadocOptions)) {
 			writer.println("-quiet");
+			writer.println("-notimestamp"); // reproducibility
 			writer.println("-protected");
 			writer.printf("%s '%s'%n", "-d", fileName(javadoc));
 			writer.println("-charset 'UTF-8'");

build.gradle

@@ -42,6 +42,7 @@ subprojects {
 				"NotThreadSafe:t:",
 				"GuardedBy:mf:\"Guarded By:\""
 			]
+			options.noTimestamp = true
 		}
 		tasks.named("test") {
 			useJUnitPlatform()

gradle-plugins/biz.aQute.bnd.gradle/build.gradle.kts

@@ -192,6 +192,14 @@ tasks.withType<AbstractArchiveTask> {
 	isReproducibleFileOrder = true
 }
 
+// Reproducible javadoc
+tasks.withType<Javadoc> {
+	options {
+		this as StandardJavadocDocletOptions // unsafe cast
+		isNoTimestamp = true
+	}
+}
+
 tasks.pluginUnderTestMetadata {
     // Include dsl SourceSet
 	pluginClasspath.from(sourceSets["dsl"].output)

maven/bnd-plugin-parent/pom.xml

@@ -294,6 +294,7 @@
 					<configuration>
 						<detectJavaApiLink>false</detectJavaApiLink>
 						<doclint>none</doclint>
+						<notimestamp>true</notimestamp>
 					</configuration>
 				</plugin>
 				<plugin>