Merge pull request 'filtered-output' (#2) from filtered-output into master

Jenkinsfile

@@ -54,7 +54,9 @@ pipeline {
         string(name: 'action_file',
                 defaultValue: '',
                 description: 'The relative path of the Bash fragment to execute.')
-
+        string(name: 'filter_with',
+                        defaultValue: '',
+                        description: 'If not empty, only actions including this filter in their output will be reported.')
 
     }
 
@@ -178,15 +180,16 @@ def exec(repo_url, repo_name) {
              output = sh(script: bashWrapper, returnStdout: true)?.trim()
         }
     }
-    def xml_action = """
-    <action repo="${repo_url}">
-        <stdout>
-            ${output}
-        </stdout>
-    </action>
-    """
-    sh "echo -e  '${xml_action}' >> $ACTION_OUTPUT"
-
+    if ((!filter_with) || (filter_with && output.contains(filter_with))) {
+        def xml_action = """
+        <action repo="${repo_url}">
+            <stdout>
+                ${output}
+            </stdout>
+        </action>
+        """
+        sh "echo -e  '${xml_action}' >> $ACTION_OUTPUT"
+    }
 }
 
 //a non CPS method is necessary for the usage of splitEachLine()