Add FOSSA checks to Jenkins CI

Signed-off-by: Dmytro Makovey <dmytro.makovey@docker.com>
Signed-off-by: Tibor Vass <tibor@docker.com>

Jenkinsfile

@@ -0,0 +1,29 @@
+
+@Library('jps')
+_
+
+pipeline {
+  agent {
+    node {
+      label 'ubuntu-1804-overlay2'
+    }
+  }
+  options {
+    disableConcurrentBuilds()
+  }
+  stages {
+    stage("FOSSA Analyze") {
+      steps {
+
+        withCredentials([string(credentialsId: 'fossa-api-key', variable: 'FOSSA_API_KEY')]) {
+          withGithubStatus('FOSSA.scan') {
+            labelledShell returnStatus: false, returnStdout: true, label: "make fossa-analyze",
+                  script:'make -f Makefile.fossa BRANCH_NAME=${BRANCH_NAME} fossa-analyze'
+            labelledShell returnStatus: false, returnStdout: true, label: "make fossa-test",
+                  script: 'make -f Makefile.fossa BRANCH_NAME=${BRANCH_NAME} fossa-test'
+          }
+        }
+      }
+    }
+  }
+}