Release procedure

1. Add new release date and versions to be released to Release history page
2. In every project to be released (frontend, middle-layer, user-admin):
   1. While in develop branch set new version in package.json (if applicable)
   2. Create a pull request develop -> master
   3. Merge it
   4. Check out master
   5. Tag master with new version. E.g. git tag v2.1.0
   6. Push tags to GitHub: git push origin --tags
   7. Build image tagged with version:
      1. E.g. docker build -t impresso/impresso-frontend:v2.1.0 .
      2. Or docker build -t impresso/impresso-middle-layer:v1.1.0 .
      3. Or docker build -t impresso/impresso-user-admin:v1.0.0 .
   8. Push image to docker hub:
      1. E.g. docker push impresso/impresso-frontend:v2.1.0
      2. Or docker push impresso/impresso-middle-layer:v1.1.0
      3. Or docker push impresso/impresso-user-admin:v1.0.0
3. Test locally with docker-compose:
   1. Make sure config folder in docker-stack project contains config files for production
   2. Edit .env file and set components versions to corresponding versions
   3. Run docker-compose up
   4. Verify that the app works via http://localhost/app
   5. Stop docker-compose and revert changes in .env file: git checkout .env
4. On production server:
   1. Edit .env file and set components versions to corresponding versions
   2. Run docker-compose pull to get new images
   3. Run docker-compose up -d to restart the app
   4. Verify that the app works via https://impresso-project.ch/app/