updating budibase apps image to use alpine

[shogunpurple]

Description

Updating our budibase/apps image to use alpine instead of slim. This is part of the ongoing work to reduce vulnerabilities in our image for an enterprise prospect. Following this merge, I can use the new alpine based hardened image as the base image for both apps and worker.

Steps:

• converted server Dockerfile and built it locally
• Used the new alpine based dockerfile in a docker compose configuration. Works as expected
• docker image ls shows that this image is now 880MB instead of the standard budibase/apps 1.16GB, so a nice saving just for updating to alpine

Addresses

• https://linear.app/budibase/issue/BUDI-8639/hardened-images-for-sailpoint

[calexiou]

lgtm!