Add (podman {image,manifest} push --sign-by-sigstore=param-file.yaml)

(podman push) and (podman manifest push) now support --sign-by-sigstore=param-file,
using the containers-sigstore-signing-params.yaml(5) file format.

That notably adds support for Fulcio and Rekor signing.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

vendor/github.com/go-openapi/runtime/client/response.go

@@ -0,0 +1,48 @@
+// Copyright 2015 go-swagger maintainers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"io"
+	"net/http"
+
+	"github.com/go-openapi/runtime"
+)
+
+var _ runtime.ClientResponse = response{}
+
+type response struct {
+	resp *http.Response
+}
+
+func (r response) Code() int {
+	return r.resp.StatusCode
+}
+
+func (r response) Message() string {
+	return r.resp.Status
+}
+
+func (r response) GetHeader(name string) string {
+	return r.resp.Header.Get(name)
+}
+
+func (r response) GetHeaders(name string) []string {
+	return r.resp.Header.Values(name)
+}
+
+func (r response) Body() io.ReadCloser {
+	return r.resp.Body
+}