add drone config

.drone.yml

@@ -0,0 +1,15 @@
+kind: pipeline
+type: docker
+name: default
+steps:
+  - name: kaniko
+    image: banzaicloud/drone-kaniko
+    settings:
+      repo: tormachris/${DRONE_REPO_NAME}
+      username:
+        from_secret: DOCKER_USERNAME
+      password:
+        from_secret: DOCKER_PASSWORD
+      tags:
+        - latest
+        - ${DRONE_BUILD_NUMBER}