golangci-lint in CI (#733)

* golangci-lint in CI

* Put CI in own job

* Run verify job

* Use go get

* Fix typo

* Name lint instead of verify

* Read the config

* Use debug tag

* Tweaks

.golangci.yml

@@ -0,0 +1,10 @@
+run:
+  build-tags:
+    - lint
+  issues-exit-code: 0 # TODO: change this to 1 when we want it to fail builds
+  skip-dirs:
+    - contrib/
+    - misc/
+linters:
+  disable:
+    - gocyclo