Add Drone configuration.

.drone.yml

@@ -0,0 +1,31 @@
+---
+kind: pipeline
+type: docker
+name: build
+
+steps:
+  - name: lint
+    image: golangci/golangci-lint:v1.43.0
+    environment:
+      CGO_ENABLED: 0
+    commands:
+      - golangci-lint run
+
+  - name: test
+    image: golang:1.17.3-alpine
+    environment:
+      CGO_ENABLED: 0
+    commands:
+      - go test ./...
+
+  - name: docker
+    image: plugins/docker
+    when:
+      branch: ["master"]
+    settings:
+      username:
+        from_secret: dockerhub_user
+      password:
+        from_secret: dockerhub_password
+      repo: pztrn/metricator
+      auto_tag: true

.gitignore

@@ -2,3 +2,4 @@
 .vscode
 metricator.yaml
 .idea
+*DS_Store*