PG_DUMPALL not executable within docker container

Steps to reproduce:

Startup Container:
```sh
synesc@dockerhost01:$ docker run --rm -it postgres:15.4 /bin/bash
```

Execute PG_DUMPALL, Params not required to see the issue.
```sh
root@13fba0e113c7:/# pg_dumpall
popen failure: Cannot allocate memory
pg_dumpall: error: program "pg_dump" is needed by pg_dumpall but was not found in the same directory as "/usr/lib/postgresql/15/bin/pg_dumpall"
root@13fba0e113c7:/#
```

Was not able to fix the problem, with full parameter list.
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