add drone

.drone.yml

@@ -0,0 +1,25 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: release
+    image: docker:dind
+    settings:
+      repo: baseimage/yamlint
+      tags:
+        - ${DRONE_TAG}
+    environment:
+      DOCKER_USERNAME:
+        from_secret: DOCKER_USERNAME
+      DOCKER_PASSWORD:
+        from_secret: DOCKER_PASSWORD
+
+    commands:
+      - docker build -t fedy95/baseimage:yamllint-${DRONE_TAG} image -f image/Dockerfile
+      - docker login registry.fedy95.com -u"$DOCKER_USERNAME" -p"$DOCKER_PASSWORD"
+      - docker push registry.fedy95.com/baseimage:yamllint-${DRONE_TAG}
+      - docker logout registry.fedy95.com
+    when:
+      event: tag