release only on master branch

.drone.yml

@@ -13,6 +13,21 @@ steps:
     commands:
       - make lint
 
+  - name: build
+    image: goreleaser/goreleaser:latest
+    volumes:
+      - name: dockersock
+        path: /var/run
+    environment:
+    commands:
+      - goreleaser build --rm-dist --snapshot
+    trigger:
+      event:
+        exclude:
+          - tag
+    depends_on:
+      - lint
+
   - name: release
     image: goreleaser/goreleaser:latest
     volumes:
@@ -28,10 +43,14 @@ steps:
       DOCKER_REGISTRY: quay.io
     commands:
       - sleep 5
-      - echo $DOCKER_PASSWORD | docker login $DOCKER_REGISTRY -u $DOCKER_USERNAME --password-stdin
+      - >
+        echo $DOCKER_PASSWORD |
+        docker login $DOCKER_REGISTRY -u $DOCKER_USERNAME --password-stdin
       - goreleaser release
-    when:
-      event: tag
+    trigger:
+      event:
+        - tag
+      branch: master
     depends_on:
       - lint