[MM-33506] Use embed package to include plugin manifest (#145)

plugin.go

@@ -0,0 +1,17 @@
+package root
+
+import (
+	_ "embed" // Need to embed manifest file
+	"strings"
+
+	"github.com/mattermost/mattermost-server/v5/model"
+)
+
+//go:embed plugin.json
+var manifestString string
+
+var Manifest model.Manifest
+
+func init() {
+	Manifest = *model.ManifestFromJson(strings.NewReader(manifestString))
+}