[bitnami/postgresql] Included networkpolicy blocks backup job from using dns about charts HOT 4 CLOSED

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I can make a PR to solve this, but it's a bit more complicated than I originally thought. Once i fixed the DNS problem in my cluster, I ran into further problems with the automatic backups. They don't seem to work with a password file, the file isn't even mounted in, and once I fix that it isn't being used. It might be a bit before I have time to troubleshoot that.

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I have this mostly working, the final problem is that once the password file is mounted in, you can't set the defaultMode of it because fsGroup overrides it. pg_dumpall refuses to use it if it's too permissive. It would need an init container to copy the secrets and set the proper permissions. I'm unlikely to tackle that, I'll probably switch back to environment variables.

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Your contribution is greatly appreciated!

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