run postunpack.sh for postgres

[developer-guy]

Fixes:

We (w/@Dentrax) realized that our postgres bitnami image is having an issue like this during the start up:

cp: can't stat '/opt/bitnami/postgresql/conf.default/.': No such file or directory

We found the following line in their Dockerfile that creates the necessary files for us:

https://github.com/bitnami/containers/blob/50f700046dc1cd8043f81103ef1fef11ea736cf4/bitnami/postgresql/15/debian-12/Dockerfile#L53

So, this PR aims to fix this issue.

Related:

Pre-review Checklist

For new package PRs only

• This PR is marked as fixing a pre-existing package request bug
  • Alternatively, the PR is marked as related to a pre-existing package request bug, such as a dependency
• REQUIRED - The package is available under an OSI-approved or FSF-approved license
• REQUIRED - The version of the package is still receiving security updates
• This PR links to the upstream project's support policy (e.g. endoflife.date)

For new version streams

• The upstream project actually supports multiple concurrent versions.
• Any subpackages include the version string in their package name (e.g. name: ${{package.name}}-compat)
• The package (and subpackages) provides: logical unversioned forms of the package (e.g. nodejs, nodejs-lts)

For security-related PRs

• The security fix is recorded in the advisories repo

For version bump PRs

• The epoch field is reset to 0

For PRs that add patches

• Patch source is documented

[developer-guy]

I created a second PR because I was assuming this PR is going to fix issue but I made mistakes, so, #14099 created this one.