feat(security): parse JSON scan results into markdown table

Keep JSON output for New Relic integration while adding JQ-based parsing to generate readable table format for PR comments

container-scan/action.yaml

@@ -99,6 +99,7 @@ runs:
         jq -r '.cve | "| Medium | \(.medium_vulnerabilities) | \(.fixable_vulnerabilities) | 0 |"' results.stdout >> pr-results.md
         jq -r '.cve | "| Low | \(.low_vulnerabilities) | \(.fixable_vulnerabilities) | 0 |"' results.stdout >> pr-results.md
         jq -r '.cve | "| Info | \(.info_vulnerabilities) | \(.fixable_vulnerabilities) | 0 |"' results.stdout >> pr-results.md
+      shell: bash
 
     - name: Check for Previous Report Comment
       id: find-comment