feat: Implement vulnerability token signing and verification utilities

- Added VulnTokenSigner for signing JWT tokens with specified algorithms and keys.
- Introduced VulnTokenUtilities for resolving tenant and subject claims, and sanitizing context dictionaries.
- Created VulnTokenVerificationUtilities for parsing tokens, verifying signatures, and deserializing payloads.
- Developed VulnWorkflowAntiForgeryTokenIssuer for issuing anti-forgery tokens with configurable options.
- Implemented VulnWorkflowAntiForgeryTokenVerifier for verifying anti-forgery tokens and validating payloads.
- Added AuthorityVulnerabilityExplorerOptions to manage configuration for vulnerability explorer features.
- Included tests for FilesystemPackRunDispatcher to ensure proper job handling under egress policy restrictions.

docs/modules/issuer-directory/operations/deployment.md

@@ -39,6 +39,13 @@
    ```
    Compose automatically mounts `../../etc/issuer-directory.yaml` into the container at `/etc/issuer-directory.yaml`, seeds CSAF publishers, and exposes the API on `https://localhost:8447`.
 
+### Compose environment variables
+| Variable | Purpose | Default |
+| --- | --- | --- |
+| `ISSUER_DIRECTORY_PORT` | Host port that maps to container port `8080`. | `8447` |
+| `ISSUER_DIRECTORY_MONGO_CONNECTION_STRING` | Injected into `ISSUERDIRECTORY__MONGO__CONNECTIONSTRING`; should contain credentials. | `mongodb://${MONGO_INITDB_ROOT_USERNAME}:${MONGO_INITDB_ROOT_PASSWORD}@mongo:27017` |
+| `ISSUER_DIRECTORY_SEED_CSAF` | Toggles CSAF bootstrap on startup. Set to `false` after the first production import if you manage issuers manually. | `true` |
+
 4. **Smoke test**
    ```bash
    curl -k https://localhost:8447/health/live