feat: create basic helm chart to run our docker app + deploy on k8s onprem and ECS with CI

Time is missing, so I just copy paste as minimal doc commits messages :-(

• feat: create basic helm chart to run our docker app
• doc: refactor file content + explain how to deploy app on K8S
• refactor: rename file to match expected name
• feat: add CI/CD job to deploy on k8s onprem
• feat: add trivy test + debug k8s job
• doc: document things done until here
• feat: create job to deploy on AWS ECS (99% inspired from ChatGPT ;-))
• doc: document new things
• feat: add fake tests to show how pipeline should be structured
• refactor: create fake deploy_prod job and extract common code in anchor + remove debug infos
• feat: extract also actions common to deploy_k8s_on_prem while creating prod
• doc: shortucs taken here