Convert heroku/stack-images to GitHub Actions

[mgomes]

Pipeline migrated from Circle CI :tada:

Manual steps

Perform the follow steps to complete the migration:

heroku/stack-images/build

• [ ] Ensure environment variable is updated: DOCKER_HUB_TOKEN
• [x] Ensure environment variable is updated: DOCKER_HUB_USERNAME
• [ ] Ensure environment variable is updated: ID_SERVICE_PASSWORD
• [x] Ensure environment variable is updated: ID_SERVICE_TOKEN_ENDPOINT
• [x] Ensure environment variable is updated: ID_SERVICE_USERNAME
• [x] Ensure environment variable is updated: INTERNAL_REGISTRY_HOST
• [x] Ensure environment variable is updated: INTERNAL_REGISTRY_USERNAME
• [ ] Ensure environment variable is updated: MANIFEST_APP_TOKEN
• [x] Ensure environment variable is updated: MANIFEST_APP_URL