[ci] Fix the name of our source file

.drone.yml

@@ -10,7 +10,7 @@ steps:
       GOOS: linux
       GOARCH: amd64
     commands:
-      - go build -o camcap main.go
+      - go build -o camcap camcap.go
 
   - name: publish-release
     image: curlimages/curl