chore: separate Docker Compose file to run app

[rwd]

1. Adds a a new Docker Compose YAML file to run the app along with the rest of the services.

   Run with docker compose -f docker-compose.app.yml up

   App will be exposed on port 8080 on the host.

   Example: run with different published image tags:

   # v1.154.0
   TAG=1.154.0 docker compose -f docker-compose.app.yml up
   
   # v1.155.0
   TAG=1.155.0 docker compose -f docker-compose.app.yml up

2. Adds IIIF_PRESENTATION_PLUGIN as a build argument for the app Docker image.

   Example: build & run local branch with different IIIF Presentation plugins:

   # mirador
   IIIF_PRESENTATION_PLUGIN=mirador TAG=${IIIF_PRESENTATION_PLUGIN} \
     docker compose -f docker-compose.app.yml up --build
   
   # list-props
   IIIF_PRESENTATION_PLUGIN=list-props TAG=${IIIF_PRESENTATION_PLUGIN} \
     docker compose -f docker-compose.app.yml up --build

[github-actions]

Preview deployment: https://pr-2393.portal-js.dev.eanadev.org/

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud