add a test script for postgres

[rishabhBudhouliya]

This test script performs three functions:

• check if postgres binaries exist in lindfs/bin
• validate if postgres --version works or not
• validate if postgres --help runs or not

I've manually tested the script and it seems to be working as stated.

Note: This PR depends on #107 to be approved and merged first.

[vidyalakshmir]

@rishabhBudhouliya This looks good and can be merged. Testing functionality can be done separately through a different script then?

[vidyalakshmir]

@rishabhBudhouliya Also where is FINDINGS.md. Saw it in the comments in test.sh

[vidyalakshmir]

Where is this file?

[rishabhBudhouliya]

Apologies, this was for me -- not supposed to commit it to remote.

[rishabhBudhouliya]

@vidyalakshmir that comment about FINDINGS.md was for me, I've removed it. The findings have been updated on the issue itself: #114 (comment)

I haven't yet investigated why we're having these failures but I wanted to understand the scope of this task. In the issue it says we are fine with test files that do sanity of compilation and placement of binaries in lindfs.
Is the task also to ensure functionalities of the said app work as well?

[rishabhBudhouliya]

@rishabhBudhouliya This looks good and can be merged. Testing functionality can be done separately through a different script then?

Got it. We'd have to #107 get this merged first.