Description

The main branch is broken when trying to build using the vendor directory (with go modules disabled)

Steps to reproduce the issue

1. Clone the repository in GOPATH (/src/go/github.com/containerd/containerd)
2. Build with GO111MODULE=off (to enforce the vendor directory to be used)

Using GO111MODULE=auto seems to work as a workaround (we're using off to allow using the same scripts for both the 1.4 and 1.5 branches)

Describe the results you received and expected

GO111MODULE=off make -C /go/src/github.com/containerd/containerd --no-print-directory DESTDIR=/root/containerd PREFIX= VERSION=20210916.065010~7ddf5e5 REVISION=7ddf5e52ba738e868b70807797c79c8e54da3497 PACKAGE=containerd.io binaries install

An error is produced:

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/connection/connection.go:33:2:
found import comments "go.opentelemetry.io/otel/exporters/otlp/internal/otlpconfig" (options.go)
and "go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig" (optiontypes.go)
in /go/src/github.com/containerd/containerd/vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig

And indeed; there's two files in the same package that have an //import comment to force them being imported:

# options.go:
package otlpconfig // import "go.opentelemetry.io/otel/exporters/otlp/internal/otlpconfig"

# optiontypes.go
package otlpconfig // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig"

What version of containerd are you using?

main

Any other relevant information

No response

Show configuration if it is related to CRI plugin.

No response