rdn: reduce number of workers to 1
Now that trixie is released the workers are mostly idle anyhow. Also
running multiple jobs at once results in OOMs.
(cherry picked from commit a2daa9c3ce526fdb9ca24d1281c56f95aa01c28e)
Signed-off-by:
Holger Levsen <holger@layer-acht.org>
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