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/middleware/operation.go

@@ -0,0 +1,30 @@
+// 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 middleware
+
+import "net/http"
+
+// NewOperationExecutor creates a context aware middleware that handles the operations after routing
+func NewOperationExecutor(ctx *Context) http.Handler {
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+		// use context to lookup routes
+		route, rCtx, _ := ctx.RouteInfo(r)
+		if rCtx != nil {
+			r = rCtx
+		}
+
+		route.Handler.ServeHTTP(rw, r)
+	})
+}