CI Jenkinsfile: use taps and fix fileformat

contrib/ci/Jenkinsfile

 pipeline {
-    agent { label 'gluon-docker' }
-    environment {
-        GLUON_SITEDIR = "contrib/ci/minimal-site"
-        GLUON_TARGET = "x86-64"
-        BUILD_LOG = "1"
-    }
-    stages {
-        stage('lint') {
-            steps {
-                sh 'luacheck package scripts targets'
-            }
-        }
-        stage('docs') {
-            steps {
-                sh 'make -C docs html'
-            }
-        }
-        stage('build') {
-            steps {
-                sh 'make update'
-                sh 'test -d /dl_cache && ln -s /dl_cache openwrt/dl || true'
-                sh 'make -j$(nproc) V=s'
-            }
-        }
-    }
+	agent { label 'gluon-docker' }
+	environment {
+		GLUON_SITEDIR = "contrib/ci/minimal-site"
+			GLUON_TARGET = "x86-64"
+			BUILD_LOG = "1"
+	}
+	stages {
+		stage('lint') {
+			steps {
+				sh 'luacheck package scripts targets'
+			}
+		}
+		stage('docs') {
+			steps {
+				sh 'make -C docs html'
+			}
+		}
+		stage('build') {
+			steps {
+				sh 'make update'
+					sh 'test -d /dl_cache && ln -s /dl_cache openwrt/dl || true'
+					sh 'make -j$(nproc) V=s'
+			}
+		}
+	}
 }