feat: allow to ignore rpms in rpmtree

When building an rpmtree allow the user to drop even more RPMs, this is
needed in cases where the RPM resolution ignore rules are not enough

Author: manuelnaranjo

internal/rpmtree.bzl

@@ -56,6 +56,17 @@ def _rpm2tar_impl(ctx):
             if rpm not in all_rpms:
                 all_rpms.append(rpm)
 
+    to_delete = []
+
+    for ignore_rpm in ctx.attr.ignore_rpms:
+        for rpm in all_rpms:
+            if rpm.basename.startswith(ignore_rpm):
+                to_delete.append(rpm)
+                break
+
+    for rpm in to_delete:
+        all_rpms.remove(rpm)
+
     for rpm in all_rpms:
         args.add_all(["--input", rpm.path])
 
@@ -96,6 +107,7 @@ _rpm2tar_attrs = {
     "capabilities": attr.string_list_dict(),
     "selinux_labels": attr.string_list_dict(),
     "out": attr.output(mandatory = True),
+    "ignore_rpms": attr.string_list(default = []),
 }
 
 _tar2files_attrs = {