Added sarif template (#558)

* Added sarif template

* Updated readme

* fixed tests

* Added integration tests and fixed all sarif validations issues

* Added tests for endWithPeriod

* Fixed tests, and added sarif golden file

* removed optional newline sequence

contrib/sarif.tpl

@@ -0,0 +1,64 @@
+{
+  "$schema": "https://raw.githubusercontent.com/oasis-tcs/sarif-spec/master/Schemata/sarif-schema-2.1.0.json",
+  "version": "2.1.0",
+  "runs": [
+    {
+      "tool": {
+        "driver": {
+          "name": "Trivy: Vulnerability Scanner for Containers",
+          "rules": [
+        {{- $t_first := true }}
+        {{- range . }}
+            {{- range .Vulnerabilities -}}
+              {{- if $t_first -}}
+                {{- $t_first = false -}}
+              {{ else -}}
+                ,
+              {{- end }}
+            {
+              "id": "[{{ .Vulnerability.Severity }}] {{ .VulnerabilityID }}",
+              "name": "container_scanning",
+              "shortDescription": {
+                "text": {{ printf "error found in package %s." (print .PkgName .Title ) | printf "%q" }}
+              },
+              "fullDescription": {
+                "text": {{ endWithPeriod .Description | printf "%q" }}
+              },
+              "defaultConfiguration": null,
+              "properties": {
+                "tags": [
+                  "{{ .PkgName }}"
+                ],
+                "precision": "very-high"
+              }
+            }
+            {{- end -}}
+         {{- end -}}
+          ]
+        }
+      },
+      "results": [
+    {{- $t_first := true }}
+    {{- range . }}
+        {{- range $index, $vulnerability := .Vulnerabilities -}}
+          {{- if $t_first -}}
+            {{- $t_first = false -}}
+          {{ else -}}
+            ,
+          {{- end }}
+        {
+          "ruleId": "[{{ $vulnerability.Vulnerability.Severity }}] {{ $vulnerability.VulnerabilityID }}",
+          "ruleIndex": {{ $index }},
+          "level": "error",
+          "message": {
+            "text": {{ endWithPeriod $vulnerability.Description | printf "%q" }}
+          },
+          "locations": []
+        }
+        {{- end -}}
+      {{- end -}}
+      ],
+      "columnKind": "utf16CodeUnits"
+    }
+  ]
+}