Commits on Sep 25, 2023

1. secrets: handle empty secrets …

   Logs error on add and treat empty file as removed on update.
   
   In particular it errors instead of using empty value
   when secret path comes from process substitution
   ```
   $ bin/routesrv -kubernetes-token-file=<(echo foobar)
   ERRO[0000] Failed to read file /dev/fd/63: empty file
   FATA[0000] failed to get secret /dev/fd/63
   ```
   
   which is a symlink to a named pipe
   ```
   $ ls -l <(echo foobar)
   lr-x------ 1 jdoe jdoe 64 Sep 25 13:36 /dev/fd/63 -> 'pipe:[7925874]'
   ```
   
   Signed-off-by: Alexander Yastrebov <alexander.yastrebov@zalando.de>

   

   AlexanderYastrebov committed Sep 25, 2023
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