Merge pull request 'Jenkinsfile' (#93) from master into release

Reviewed-on: https://git.shs.tools/SHS/shstk/pulls/93

Jenkinsfile

@@ -1,6 +1,6 @@
 def build_docker(name, release_dir) {
-	def image = "${name}-shstk"
-	echo "Build image ${image}"
+	def image_name = "${name}-shstk"
+	echo "Build image ${image_name}"
 	def pref = ""
 	if (env.DOCKER_PREFIX) {
 		pref = "--build-arg DOCKER_PREFIX=${env.DOCKER_PREFIX}/"
@@ -10,13 +10,13 @@ def build_docker(name, release_dir) {
 		jobs = "${env.JOBS_COUNT}"
 	}
 	def args = "${pref} --build-arg LIBS_BUILD_NUMBER=${env.BUILD_NUMBER} --build-arg JOBS_COUNT=${jobs}"
-	dir ("docker/${image}") {
-		sh "docker build ${args} --no-cache -t ${image} ."
-		docker.image('${image}').inside('-v ${release_dir}:/soft/release') {
+	dir ("docker/${image_name}") {
+		sh "docker build ${args} --no-cache -t ${image_name} ."
+		docker.image(image_name).inside('-v ${release_dir}:/soft/release') {
 			sh 'cp -vf /soft/shstk/release/* /soft/release/'
 		}
 	}
-	return "\n - ${image}"
+	return "\n - ${image_name}"
 }
 node {
 	stage("checkout") {