Add alpine build

.circleci/config.yml

@@ -46,6 +46,13 @@ workflows:
               ignore: /.*/
             tags:
               only: /^\d+\.\d+.*/
+      - build-alpine-image:
+          context: dockerhub
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              only: /^\d+\.\d+.*/
       - build-armhf-image:
           context: dockerhub
           filters:
@@ -82,6 +89,26 @@ jobs:
           name: Push image
           command: docker push $IMAGE_NAME:$IMAGE_TAG
 
+  build-alpine-image:
+    environment:
+      IMAGE_NAME: haugene/transmission-openvpn
+    docker:
+      - image: circleci/buildpack-deps:stretch
+    steps:
+      - checkout
+      - setup_remote_docker
+      - calculate-tag-name:
+          distro: alpine
+      - run:
+          name: Build Docker image
+          command: docker build -t $IMAGE_NAME:$IMAGE_TAG -f Dockerfile.alpine .
+      - run:
+          name: Login to Docker Hub
+          command: echo $DOCKER_PASS | docker login -u $DOCKER_USER --password-stdin
+      - run:
+          name: Push image
+          command: docker push $IMAGE_NAME:$IMAGE_TAG
+
   build-armhf-image:
     environment:
       IMAGE_NAME: haugene/transmission-openvpn