Keep the container image minimal

[sks]

Description

• Changing the base image to be alpine to save on container size

## Before
 ghcr.io/openflagr/flagr              latest    2c7473a02b44   4 months ago     2GB

## After
flagr                               latest    7474e3e001c1   37 minutes ago   68.1MB

Motivation and Context

• Reducing the container size for faster downloads and better day 1 Experience.

How Has This Been Tested?

• To be frank, not in big sets, New to flagr, will check on how the github action goes and take necessary steps.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[sks]

Looks like this was already done in #107 and then reverted, will reopen after reading about the history on the reasons

[sks]

Not sure if this was a miss while merging openflagr , keeping the PR open for now

[ghost]

👇 Click on the image for a new way to code review

Legend

[nothing0012]

let's also change the integration test docker, so that we test the dockerfile change end to end

[codecov-commenter]

Codecov Report

Merging #557 (9cf92fb) into main (decc484) will not change coverage.
The diff coverage is n/a.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@           Coverage Diff           @@
##             main     #557   +/-   ##
=======================================
  Coverage   81.07%   81.07%           
=======================================
  Files          28       28           
  Lines        2256     2256           
=======================================
  Hits         1829     1829           
  Misses        337      337           
  Partials       90       90           

📣 Codecov offers a browser extension for seamless coverage viewing on GitHub. Try it in Chrome or Firefox today!

[nothing0012]

thank you!

[sks]

Can we merge this ?