check modernize in CI

Author: elithrar

.github/workflows/build-test.yml

@@ -20,6 +20,11 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Check modernize
+        run: |
+          go run golang.org/x/tools/go/analysis/passes/modernize/cmd/modernize@latest -fix ./...
+          git diff --exit-code
+
       - name: Build
         run: go build ./cmd/artifact-fs