warn about function argument count over 5 (#558)

* warn about function argument count over 5
* only on new code
Signed-off-by: Fabian Kammel <fk@edgeless.systems>

.github/workflows/test-lint.yml

@@ -54,3 +54,4 @@ jobs:
           skip-pkg-cache: true
           skip-build-cache: true
           args: --timeout=15m ${{ steps.submods.outputs.submods }}
+          only-new-issues: true

.golangci.yml

@@ -46,3 +46,10 @@ linters-settings:
     exclude-functions:
       - (*go.uber.org/zap.Logger).Sync
       - (*google.golang.org/grpc.Server).Serve
+  revive:
+    rules:
+      - name: argument-limit
+        disabled: false
+        arguments:
+          - 5
+        severity: warning