AppleHV enablement pass #2

* Use vfkit command line assembly
* Inject ignition file into guest using http over vsock
* Ready notification through use of vsock

[NO NEW TESTS NEEDED]

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

vendor/github.com/gin-gonic/gin/render/text.go

@@ -0,0 +1,41 @@
+// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gin-gonic/gin/internal/bytesconv"
+)
+
+// String contains the given interface object slice and its format.
+type String struct {
+	Format string
+	Data   []any
+}
+
+var plainContentType = []string{"text/plain; charset=utf-8"}
+
+// Render (String) writes data with custom ContentType.
+func (r String) Render(w http.ResponseWriter) error {
+	return WriteString(w, r.Format, r.Data)
+}
+
+// WriteContentType (String) writes Plain ContentType.
+func (r String) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, plainContentType)
+}
+
+// WriteString writes data according to its format and write custom ContentType.
+func WriteString(w http.ResponseWriter, format string, data []any) (err error) {
+	writeContentType(w, plainContentType)
+	if len(data) > 0 {
+		_, err = fmt.Fprintf(w, format, data...)
+		return
+	}
+	_, err = w.Write(bytesconv.StringToBytes(format))
+	return
+}