Maybe like this

Dorthu · Dorthu · commit 72b0e928a350 · 2018-04-17T13:04:40.000-04:00
diff --git a/Jenkinsfile b/Jenkinsfile
@@ -11,7 +11,6 @@ environment {
     API_VERSION = 'v4' // used by docs - TODO can remove?
     BUILD_ENV = "${(env.BRANCH_NAME != 'master') ? env.BRANCH_NAME : '' }"
     // POST_TAG_COMMITS = "$post_tag_commits" - TODO can remove?
-    BUILD_TAG = URLDecoder.decode(env.BUILD_TAG, "UTF-8").replaceAll("[^a-zA-Z0-9_.-]", "_")
 }
 
 node {
@@ -24,7 +23,8 @@ node {
     }
 
     stage('Build Docker') {
-        image = docker.build(env.BUILD_TAG.toLowerCase(), '.')
+        BUILD_NAME = URLDecoder.decode(env.BUILD_TAG, "UTF-8").replaceAll("[^a-zA-Z0-9_.-]", "_")
+        image = docker.build(BUILD_NAME.toLowerCase(), '.')
     }
 
     stage ('Apply Environment') {

Original file line number	Diff line number	Diff line change
`@@ -11,7 +11,6 @@ environment {`
`11`	`11`	`API_VERSION = 'v4' // used by docs - TODO can remove?`
`12`	`12`	`BUILD_ENV = "${(env.BRANCH_NAME != 'master') ? env.BRANCH_NAME : '' }"`
`13`	`13`	`// POST_TAG_COMMITS = "$post_tag_commits" - TODO can remove?`
`14`		`- BUILD_TAG = URLDecoder.decode(env.BUILD_TAG, "UTF-8").replaceAll("[^a-zA-Z0-9_.-]", "_")`
`15`	`14`	`}`
`16`	`15`
`17`	`16`	`node {`
`@@ -24,7 +23,8 @@ node {`
`24`	`23`	`}`
`25`	`24`
`26`	`25`	`stage('Build Docker') {`
`27`		`- image = docker.build(env.BUILD_TAG.toLowerCase(), '.')`
	`26`	`+ BUILD_NAME = URLDecoder.decode(env.BUILD_TAG, "UTF-8").replaceAll("[^a-zA-Z0-9_.-]", "_")`
	`27`	`+ image = docker.build(BUILD_NAME.toLowerCase(), '.')`
`28`	`28`	`}`
`29`	`29`
`30`	`30`	`stage ('Apply Environment') {`