Instead of using absolute paths to Postgres binaries, and in doing so,
hard-coding the Postgres version number, we add the bin folder to `PATH`
so they're available directly.
This also won't need the `current` symlink we created. That symlink is
causing problems in some post-installations scripts in `apt`/`dpkg`,
since they're expecting a _number_ in that folder, and sees `current`,
it's confused and produces this error:
```
dpkg: warning: version 'current' has bad syntax: version number does not start with digit
```
After this is merged, we should be able to get rid of the `current`
symlink as well.
**/test sanity**
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/9541787920>
> Commit: 1012266e0924248b0f13a91bee464303e86b87a6
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9541787920&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity`
<!-- end of auto-generated comment: Cypress test results -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Chores**
- Updated Docker configurations to streamline PostgreSQL 13 integration.
- Simplified PostgreSQL commands in scripts by removing explicit
versioning paths.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Description
PR to update the version references for postgres. This will help us in
keeping the diff minimum between release and pg branch as we will be
upgrading the postgres version to 15 on pg branch.
## Automation
/ok-to-test tags=""
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!CAUTION]
> If you modify the content in this section, you are likely to disrupt
the CI result for your PR.
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [x] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Chores**
- Updated Docker scripts to use a generic placeholder for PostgreSQL
version, enhancing flexibility and future-proofing the setup.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
When PostgreSQL starts, we see the following errors in the logs:
```
mkdir:
cannot create directory ‘/tmp/appsmith/postgres-stats’
: Permission denied
```
And then this over and over again:
```
postgres stdout | 2023-09-19 15:34:34.504 UTC [1759] LOG: could not open temporary statistics file "/tmp/appsmith/postgres-stats/global.tmp": No such file or directory
```
The problem is that in `postgres.conf`, we set `user=postgres`, which
doesn't have access to create things in `/tmp`.
This PR removes this configuration and lets the default be, which will
be a temp folders _under_ the data directory.
