add openfasttrace 4.2.0

https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/itsallcode/openfasttrace/README.md

Author: hboutemy

content/org/itsallcode/openfasttrace/openfasttrace-4.2.0.buildspec

@@ -0,0 +1,18 @@
+groupId=org.itsallcode.openfasttrace
+artifactId=openfasttrace
+display=${groupId}:${artifactId}
+version=4.2.0
+
+gitRepo=https://github.com/itsallcode/openfasttrace.git
+gitTag=${version}
+
+tool=mvn
+jdk=17
+newline=lf
+#umask=022
+
+command="mvn package -DskipTests -Dmaven.javadoc.skip -Dgpg.skip"
+buildinfo=product/target/${artifactId}-${version}.buildinfo
+
+#diffoscope=${artifactId}-${version}.diffoscope
+issue=