Add experimental staticcheck into linting CI

See https://staticcheck.io for more. This is set to be ignored
on failure so that it doesn't disrupt current work flows but maybe
it is nice to add. Just drop the `ignore: ...` line and it will fail
builds.

Makefile

@@ -4,7 +4,7 @@ GOPATH  := $(shell go env GOPATH)
 VERSION := $(shell cat ./version)
 LDFLAGS := "-X 'main.Commit=$(COMMIT)' -X 'main.Version=$(VERSION)'"
 
-all: run install build clean format check
+all: run install build clean format check static
 
 run:
 	@go run -ldflags=$(LDFLAGS) $(ABRA)
@@ -23,3 +23,6 @@ format:
 
 check:
 	@test -z $$(gofmt -l .) || (echo "gofmt: formatting issue - run 'make format' to resolve" && exit 1)
+
+static:
+	@staticcheck $(ABRA)