test: integrate new test target into CI build

.drone.yml

@@ -22,6 +22,11 @@ steps:
     commands:
       - make build
 
+  - name: make test
+    image: golang:1.16
+    commands:
+      - make test
+
   - name: notify on failure
     image: plugins/matrix
     settings:
@@ -33,6 +38,7 @@ steps:
     depends_on:
       - make check
       - make build
+      - make test
     when:
       status:
         - failure