use custom version command

Jenkinsfile

@@ -100,16 +100,16 @@ pipeline {
     /* ########################
        External Release Tagging
        ######################## */
-    // If this is a custom json endpoint parse the return to get external tag
-    stage("Set ENV custom_json"){
-     steps{
-       script{
-         env.EXT_RELEASE = sh(
-           script: '''curl -s ${JSON_URL} | jq -r ". | ${JSON_PATH}" ''',
-           returnStdout: true).trim()
-         env.RELEASE_LINK = env.JSON_URL
-       }
-     }
+    // If this is a custom command to determine version use that command
+    stage("Set tag custom bash"){
+      steps{
+        script{
+          env.EXT_RELEASE = sh(
+            script: ''' curl -sL https://radarr.servarr.com/v1/update/nightly/changes?os=linux | jq -r '.[0].version' ''',
+            returnStdout: true).trim()
+            env.RELEASE_LINK = 'custom_command'
+        }
+      }
     }
     // Sanitize the release tag and strip illegal docker or github characters
     stage("Sanitize tag"){
@@ -664,7 +664,7 @@ pipeline {
              "tagger": {"name": "LinuxServer Jenkins","email": "jenkins@linuxserver.io","date": "'${GITHUB_DATE}'"}}' '''
         echo "Pushing New release for Tag"
         sh '''#! /bin/bash
-              echo "Data change at JSON endpoint ${JSON_URL}" > releasebody.json
+              echo "Updating to ${EXT_RELEASE_CLEAN}" > releasebody.json
               echo '{"tag_name":"'${EXT_RELEASE_CLEAN}'-ls'${LS_TAG_NUMBER}'",\
                      "target_commitish": "nightly",\
                      "name": "'${EXT_RELEASE_CLEAN}'-ls'${LS_TAG_NUMBER}'",\

jenkins-vars.yml

@@ -2,7 +2,8 @@
 
 # jenkins variables
 project_name: docker-radarr
-external_type: custom_json
+external_type: na
+custom_version_command: curl -sL https://radarr.servarr.com/v1/update/nightly/changes?os=linux | jq -r '.[0].version'
 release_type: prerelease
 release_tag: nightly
 ls_branch: nightly