[Backport release/3.5.x] fix(vault): properly warmups the cache on init #11827
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### Summary
Fixes issue where this was logged to logs:
```
2023/10/18 13:53:33 [warn] 8714#0: [kong] vault.lua:861 error updating secret reference {vault://env/PG_USER}: could not find cached value
```
That happened for example when starting Kong with this command:
```
KONG_LOG_LEVEL=warn PG_USER=kong KONG_PG_USER={vault://env/PG_USER} ./bin/kong start
```
It auto-corrected itself, which was good in this case.
This commit makes it more robust, and does not warn anymore
as caches are properly warmed.
Signed-off-by: Aapo Talvensaari <aapo.talvensaari@gmail.com>
(cherry picked from commit d8bd50d)
bungle
approved these changes
Oct 24, 2023
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Backport d8bd50d from #11793.