Migrate nginx images to be build from Dockerfile same as the varnishes

[awmackowiak]

The nginx images were pulled from the docker.io which was built 8 years ago, so the format of the image (nginx) now stops being supported by the Docker

(master) $ docker-compose -f docker-compose.yml -f docker-compose.override.yml up --build
WARN[0000] /Users/artur.mackowiak/Projects/Pluton/vaas_software/vaas/docker-compose.yml: `version` is obsolete
WARN[0000] /Users/artur.mackowiak/Projects/Pluton/vaas_software/vaas/docker-compose.override.yml: `version` is obsolete
[+] Running 2/6
 ✘ nginx-5 Error   context 5.5s
 ⠼ nginx-1 Pulling 5.5s
 ⠼ nginx-4 Pulling 5.5s
 ⠼ nginx-3 Pulling 5.5s
 ✘ nginx-2 Error   context canceled 5.5s
 ⠼ nginx-0 Pulling 5.5s
[DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release. Suggest the author of docker.io/allegro/vaas-nginx:latest to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/
(master) $ 

What has been done:

• add the build fields in docker compose definitions for nginx that it starts to be built locally based on Docker file
• get rid of version key in compose definitions because of obsoletion