Add drone ci config

build/ci/drone.yml

@@ -0,0 +1,43 @@
+---
+kind: pipeline
+name: testing
+
+steps:
+- name: vet
+  image: golang:1.13
+  commands:
+    - go vet ./...
+
+- name: test
+  image: golang:1.13
+  commands:
+    - go test -v ./...
+
+---
+kind: pipeline
+name: build
+
+steps:
+- name: openbsd-amd64
+  image: golang:1.13
+  environment:
+    GOARCH: amd64
+    GOOS: openbsd
+  commands:
+    - go build
+
+- name: linux-amd64
+  image: golang:1.13
+  environment:
+    GOARCH: amd64
+    GOOS: linux
+  commands:
+    - go build
+
+- name: darwin-amd64
+  image: golang:1.13
+  environment:
+    GOARCH: amd64
+    GOOS: darwin
+  commands:
+    - go build