Feature: Change portal deployment to next major instead of latest

[kbeaugrand]

Is your feature request related to a problem? Please describe.
Our templates are deploying the latest version of the portal.

Describe the solution you'd like
Change the docker tag to point to the next major version that should be deployed.

Describe alternatives you've considered
N/A

Additional context
Investigate to automatically point the the major version from the CI.

[kbeaugrand]

We might use sed to replace the image tag uri from the bicep files:
's/ghcr.io\/cgi-fr\/iothub-portal:latest/ghcr.io\/cgi-fr\/iothub-portal:3/'

The sed command will be used at

IoT-Hub-Portal/.github/workflows/publish.yml

Line 108 in 634f85a

sed -r -i 's/..\/iotedge-lorawan-starterkit\/TemplateBicep\/main.bicep/.\/iotedge-lorawan-starterkit\/main.bicep/g' ./templates/azuredeploy.bicep

The version should not be hard coded, it should be taken from the release pipeline (the current tag of the release)