Merge branch '43-docker_trivy_addr-should-not-be-mandatory-in-kicker' into 'master'

Resolve "DOCKER_TRIVY_ADDR should not be mandatory in Kicker"

Closes #43

See merge request to-be-continuous/docker!53

kicker.json

@@ -158,8 +158,7 @@
         {
           "name": "DOCKER_TRIVY_ADDR",
           "type": "url",
-          "description": "The Trivy server address",
-          "mandatory": true
+          "description": "The Trivy server address"
         },
         {
           "name": "DOCKER_TRIVY_SECURITY_LEVEL_THRESHOLD",