Update transitdata repositories to use organization-level secrets

[LofhJann]

Currently transitdata-vehicleposition-processor uses repository-level secrets for docker-hub. These should be replaced with corresponding organization-level secrets from HSLdevcom organization.

Replace following

• secrets.DOCKER_USERNAME with secrets.TRANSITDATA_DOCKERHUB_USER
• secrets.DOCKER_PASSWORD with secrets.TRANSITDATA_DOCKERHUB_PASSWORD

Tasklist:

• Update to dev branch
• Test it works in dev branch
• Merge changes to release branch (master?)
• Remove old secrets from repository (contact admin if necessary)

[mjaakko]

The same update should be done for all Transitdata repos

[teemu8655]

Organization secrets allowed to all transitdata repos. Next @LofhJann can remove repo sercets.

[mjaakko]

Correct config:

          username: ${{ secrets.TRANSITDATA_DOCKERHUB_USER }}
          password: ${{ secrets.TRANSITDATA_DOCKERHUB_TOKEN }}

[LofhJann]

All transitdata repos should be now updated to use org-level repos in develop branches. Master/main is still using old secrets so they shouldn't be removed yet