Add a user in the trivy-k8s-wrapper Dockerfile
Problem statement
Currently we run the trivy-k8s-wrapper image as root. As a result we get this https://gitlab.com/gitlab-org/security-products/analyzers/trivy-k8s-wrapper/-/security/vulnerabilities/100247859#note_1806492926
Propose solution
We need to add a user in the dockerfile and make sure that the trivy-k8s-wrapper can write in the app directory.