feat(trivy): Enhance Trivy report generation and metrics handling

- Updated `generate_report.sh` to include additional scanners and output paths.
- Enhanced `send_report.py` with new data classes for misconfigurations and vulnerabilities.
- Improved parsing logic for Trivy output, supporting both Kubernetes and image scans.
- Added Prometheus metrics generation for various scan results, including misconfigurations and vulnerabilities.
- Introduced unit tests for parsing Trivy output and generating Prometheus metrics.
- Modified Terraform variables for SMTP port type and added Pushgateway URL variable.

terraform/modules/utils/trivy/variables.tf

@@ -10,7 +10,7 @@ variable "smtp_host" {
 
 variable "smtp_port" {
   description = "The SMTP relay port"
-  type        = number
+  type        = string
 }
 
 variable "smtp_username" {
@@ -43,7 +43,6 @@ variable "cron_schedule" {
 variable "tag" {
   description = "The version of Trivy to install"
   type        = string
-  default     = "latest"
 }
 
 variable "report_type" {
@@ -57,3 +56,9 @@ variable "levels" {
   type        = string
   default     = "HIGH,CRITICAL"
 }
+
+variable "pushgateway_url" {
+  description = "URL of the Prometheus Pushgateway including /metrics/job/<job> path"
+  type        = string
+  default     = "http://pushgateway.prometheus.svc.cluster.local:9091/metrics/job/trivy-metrics"
+}