docs: add Trivy scan badges

README.md

@@ -48,7 +48,7 @@ They use the following configuration.
 
 | Input / Variable | Description                            | Default value     |
 | --------------------- | -------------------------------------- | ----------------- |
-| `image` / `GITLEAKS_IMAGE` | The Docker image used to run Gitleaks  | `registry.hub.docker.com/zricethezav/gitleaks:latest` |
+| `image` / `GITLEAKS_IMAGE` | The Docker image used to run Gitleaks  | `registry.hub.docker.com/zricethezav/gitleaks:latest` <br/>[![Trivy Badge](https://to-be-continuous.gitlab.io/doc/secu/trivy-badge-GITLEAKS_IMAGE.svg)](https://to-be-continuous.gitlab.io/doc/secu/trivy-GITLEAKS_IMAGE) |
 | `rules` / `GITLEAKS_RULES` | Gitleaks [configuration rules](https://github.com/zricethezav/gitleaks#configuration) to use (you may also provide your own `.gitleaks.toml` configuration file in your project). | _none_ (uses default rules) |
 | `args` / `GITLEAKS_ARGS` | [Options](https://github.com/zricethezav/gitleaks/wiki/Options) for a full Gitleaks analysis (on master or develop branches) | `--verbose --redact` |