build(pmp-api): minimize api image

[MaciejSikorski]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/valueadd-poland/pimp-my-pr/blob/master/CONTRIBUTING.md#git-guidelines
• Tests for the changes have been added (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Locally I noticed that the API image has the size of 1GB

Issue Number: N/A

What is the new behavior?

Locally the API image has the size of 350MB

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Can be still improved by removing angular dependencies, but it can't be easily achieved because of valueadd-poland/valueadd#54
Additionally, we can choose a different way to achieve a smaller bundle size. We need to check the result of this question