The tidy build target doesn't tidy all the modules

[jpeach]

Summary

If you do make tidy, it only runs go mod tidy on the modules in . ./api/ ./pkg/plugins/resources/k8s/native.
I was expecting it to be able to tidy all the modules in the repository.

xref #2087

[jpeach]

xref #2069
xref #2068
xref #2066
xref #2065
xref #2031
xref #2030
xref #2029
xref #2028
xref #2025

[jpeach]

This updates the tidy target, but runs into module dependency problems

diff --git mk/check.mk mk/check.mk
index ca1fa3ad..0a1b2fc3 100644
--- mk/check.mk
+++ mk/check.mk
@@ -21,12 +21,13 @@ vet: ## Dev: Run go vet
 
 .PHONY: tidy
 tidy:
-       @TOP=$(shell pwd) && \
-       for m in . ./api/ ./pkg/plugins/resources/k8s/native; do \
-               cd $$m ; \
-               rm go.sum ; \
-               go mod tidy ; \
-               cd $$TOP; \
+       for m in $$(find . -name go.mod | grep -v ./vendored); do \
+               ( \
+                       set -o errexit; \
+                       cd $$(dirname $$m); \
+                       echo tidying $$(pwd); \
+                       go mod tidy; \
+               ) \
        done
 
 .PHONY: golangci-lint

[jpeach]

The embedded Go module for k8s/native was removed in #2360. Remaining modules are:

./go.mod
./pkg/transparentproxy/istio/go.mod
./vendored/github.com/prometheus/prometheus/go.mod

But you can't tidy the istio submodule

~/upstream/konghq/kuma/pkg/transparentproxy/istio$ go mod tidy
go: finding module for package github.com/kumahq/kuma/pkg/transparentproxy/config
go: downloading github.com/kumahq/kuma v1.2.1
go: found github.com/kumahq/kuma/pkg/transparentproxy/config in github.com/kumahq/kuma v1.2.1
go: github.com/kumahq/kuma@v1.2.1 requires