fix(vault): support array type config reference and multiple nginx subsystem #13855
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### Summary
Some properties, like `KONG_SSL_CERT` and `KONG_SSL_CERT_KEY` are
arrays and users can specify many. Vaults didn't work in this scenario:
For example below didn't work before:
```
CERT_1=$(<cert1.crt) \
KEY_1=$(<key1.key) \
CERT_2=$(<cert2.crt) \
KEY_2=$(<key2.key) \
KONG_SSL_CERT_KEY="{vault://env/key-1},{vault://env/key-2}" \
KONG_SSL_CERT="{vault://env/cert-1},{vault://env/cert-2}" \
kong prepare --vv
```
There were also erroneous warning in logs like because of bad array handling:
```
[warn] 680#0: [kong] vault.lua:1475 error caching secret reference {vault://env/cert-1}: bad value type
```
This fixes those.
Signed-off-by: Aapo Talvensaari <aapo.talvensaari@gmail.com>
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Summary
This is a superset of #12672
The PR includes the following fix for vault:
conf_loadernow supports iterate through array-like configuration field and deref the secrets one by one.lua_ssl_trusted_certificate=system, {vault://abc/def}. This is implemented especially for resty environments that execute the actual kong command, with the optspre_cmd = true. Vault related functionalities can work normally by using valid partial configuration generated in thepre_cmdenvironment. This change does not have a separate changelog entry because it is part of the previous "array-type config vault ref" fix and is more inline with user's intuition.kong_processed_secretsenvironment variable/file are now generated by subsystems, so enabling multiple subsystem will generates multiple env var/secret file for storing vault deref result.Checklist
changelog/unreleased/kongorskip-changeloglabel added on PR if changelog is unnecessary. README.mdIssue reference
FTI-6163