Changed name of variable to store ACR name instead of ACR username

Jenkinsfile

@@ -7,7 +7,7 @@ pipeline {
     }
 
     environment {
-        ACR_USERNAME = 'marcin00'
+        ACR_NAME = 'marcin00'
         CLIENT_ID = 'c302726f-fafb-4143-94c1-67a70975574a'
         DOCKER_REGISTRY_URL = 'marcin00.azurecr.io'
         DOCKER_IMAGE = "${DOCKER_REGISTRY_URL}/user-microservice:${GIT_COMMIT}"
@@ -40,7 +40,7 @@ pipeline {
                     sh '''
                     docker build -t ${DOCKER_IMAGE} .
                     az login --identity --client-id ${CLIENT_ID}
-                    az acr login --name marcin00
+                    az acr login --name ${ACR_NAME}
                     docker push ${DOCKER_IMAGE}
                     '''
                 }