add rockcraft-parent 1.2.2

https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/io/github/rockcrafters/plugins/README.md

Author: hboutemy

content/io/github/rockcrafters/plugins/rockcraft-parent-1.2.2.buildspec

@@ -0,0 +1,18 @@
+groupId=io.github.rockcrafters
+artifactId=rockcraft-parent
+display=${groupId}:java-rockcraft-plugins
+version=1.2.2
+
+gitRepo=https://github.com/rockcrafters/java-rockcraft-plugins.git
+gitTag=${version}
+
+tool=mvn
+jdk=17
+newline=lf
+#umask=022
+
+command="mvn -Papache-release clean package -DskipTests -Dmaven.javadoc.skip -Dgpg.skip"
+buildinfo=target/${artifactId}-${version}.buildinfo
+
+#diffoscope=${artifactId}-${version}.diffoscope
+issue=