Move skopeo to go.podman.io

With potential repo moves and cirus EOL, we have decided to begin
preparing by making changes to the skopeo module name.  See
https://github.com/containers/go.podman.io/pull/6 for more information.

Signed-off-by: Brent Baude <bbaude@redhat.com>

Makefile

@@ -263,7 +263,7 @@ validate-docs: bin/skopeo
 	hack/xref-helpmsgs-manpages
 
 test-unit-local:
-	$(GO) test $(SKOPEO_LDFLAGS) -tags "$(BUILDTAGS)" $$($(GO) list -tags "$(BUILDTAGS)" -e ./... | grep -v '^github\.com/containers/skopeo/\(integration\|vendor/.*\)$$')
+	$(GO) test $(SKOPEO_LDFLAGS) -tags "$(BUILDTAGS)" $$($(GO) list -tags "$(BUILDTAGS)" -e ./... | grep -v '^go\.podman\.io/skopeo/\(integration\|vendor/.*\)$$')
 
 vendor:
 	$(GO) mod tidy

cmd/skopeo/inspect.go

@@ -7,7 +7,6 @@ import (
 	"io"
 	"strings"
 
-	"github.com/containers/skopeo/cmd/skopeo/inspect"
 	"github.com/docker/distribution/registry/api/errcode"
 	"github.com/opencontainers/go-digest"
 	v1 "github.com/opencontainers/image-spec/specs-go/v1"
@@ -20,6 +19,7 @@ import (
 	"go.podman.io/image/v5/manifest"
 	"go.podman.io/image/v5/transports"
 	"go.podman.io/image/v5/types"
+	"go.podman.io/skopeo/cmd/skopeo/inspect"
 )
 
 type inspectOptions struct {

cmd/skopeo/main.go

@@ -7,13 +7,13 @@ import (
 	"strings"
 	"time"
 
-	"github.com/containers/skopeo/version"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	commonFlag "go.podman.io/common/pkg/flag"
 	"go.podman.io/image/v5/pkg/cli/basetls/tlsdetails"
 	"go.podman.io/image/v5/signature"
 	"go.podman.io/image/v5/types"
+	"go.podman.io/skopeo/version"
 	"go.podman.io/storage/pkg/reexec"
 )
 

go.mod

@@ -1,4 +1,4 @@
-module github.com/containers/skopeo
+module go.podman.io/skopeo
 
 // Minimum required golang version
 go 1.25.6

integration/check_test.go

@@ -5,10 +5,10 @@ import (
 	"os/exec"
 	"testing"
 
-	"github.com/containers/skopeo/version"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"github.com/stretchr/testify/suite"
+	"go.podman.io/skopeo/version"
 )
 
 const (