Add Drone tests (#13)

Add Drone tests

Reviewed-on: https://git.etztech.xyz/Etzelia/sedbot/pulls/13

.drone.yml

@@ -0,0 +1,18 @@
+---
+kind: pipeline
+name: compliance
+trigger:
+  event:
+    - pull_request
+steps:
+  - name: build
+    pull: always
+    image: golang:1.15
+    commands:
+      - make test
+      - make build-all
+  - name: check
+    pull: always
+    image: golang:1.15
+    commands:
+      - make vet