[#597] feat: add submission tool backend to validate metadata

[MSzalowski]

List of changes

• add minimal backend application that:
  • validates hash and metadata URL using /validate-metadata endpoint
  • provides submission tool app API documentation using swagger
  • uses docker to containerize application
  • uses health checks to make sure that application is up & running

Checklist

• related issue
• My changes generate no new warnings
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the changelog
• I have added tests that prove my fix is effective or that my feature works

[Sworzen1]

i think its not bad request :D from FE side but not valid metadata or json

[MSzalowski]

Hmm, make sense. I'll return 200with object containing validation status

[Sworzen1]

Why rxjs only for do request and catch error :D ?, you can do the same using axios. Will we want to build more complicated chains ?

[MSzalowski]

Why rxjs only for do request and catch error :D ?, you can do the same using axios. Will we want to build more complicated chains ?

HttpService by default returns Observable and it is recommended in docs to use the rxjs to handle that. Moreover rxjs is typically the default approach for any observables. As this code is to be owned by community I do not want to create some custom solutions where we have well-documented solutions