feat: finish postgres cli

Implemented basic wanted functionality for postgres subcommands. We
currently assume that postgres is running in docker-compose project in a
service named "postgresdb". This could be looked at and changed at some
point in the future.

src/scripts/mod.rs

@@ -7,7 +7,7 @@ use std::{
     ffi::OsStr,
     fs::{File, OpenOptions},
     path::PathBuf,
-    process::Command,
+    process::{Command, Stdio},
 };
 
 use anyhow::{Context, Result};
@@ -47,6 +47,12 @@ impl DockerCommand {
         self.command.spawn()?.wait()?;
         Ok(())
     }
+
+    fn write_stdout(mut self, stdio: Stdio) -> Result<()> {
+        self.command.stdout(stdio);
+        self.spawn_wait()?;
+        Ok(())
+    }
 }
 
 fn safe_create_file(path: PathBuf) -> Result<File, std::io::Error> {