Added prune limits to avoid repo runs out of space

Author: jkellerer

contrib/posix/conf.d/prune.conf

@@ -29,4 +29,16 @@ default-command = "prune"
 [prune.prune]
 schedule = "daily"
 schedule-lock-wait = "4h"
-
+# Auto remove old cache directories in the local cache
+cleanup-cache = true
+# Repacking (repository compaction)
+# Limited by:
+# - `max-unused` (higher precentage, less repacking)
+# - `max-repack-size` (lower size value, less repacking)
+#
+# Repacking requires up to `max-repack-size` temporary space in the repository,
+# ensure it has the configured size available at least before running prune.
+max-repack-size = "5g"
+# Tolerate given limit of unused data (default 5%)
+# A higher percentage performs less repacking which will speedup prune.
+max-unused = "5%"