trivy: add page

pages/common/trivy.md

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+# trivy
+
+> Scanner for vulnerabilities in container images, file systems, and Git repositories, as well as for configuration issues.
+> More information: <https://github.com/aquasecurity/trivy>.
+
+- Scan an image:
+
+`trivy image {{image:tag}}`
+
+- Scan the filesystem for vulnerabilities and misconfigurations:
+
+`trivy fs --security-checks {{vuln,config}} {{path/to/project_directory}}`
+
+- Scan a directory for misconfigurations:
+
+`trivy config {{path/to/iac_directory}}`
+
+- Generate output with a SARIF template:
+
+`trivy image --format {{template}} --template {{"@sarif.tpl"}} -o {{path/to/report.sarif}} {{image:tag}}`