vendorise upstream opkg app

This is for experimenting with building a LuCI app.
I hope we can take this as a base and extend it to our needs.
The source is
https://github.com/openwrt/luci/raw/openwrt-22.03/applications/luci-app-opkg/htdocs/luci-static/resources/view/opkg.js

srl-blue-merle/usr/share/luci/menu.d/luci-app-opkg2.json

@@ -0,0 +1,13 @@
+{
+	"admin/system/opkg2": {
+		"title": "Software",
+		"order": 30,
+		"action": {
+			"type": "view",
+			"path": "opkg2"
+		},
+		"depends": {
+			"acl": [ "luci-app-opkg2" ]
+		}
+	}
+}

srl-blue-merle/usr/share/rpcd/acl.d/luci-app-opkg2.json

@@ -0,0 +1,29 @@
+{
+	"luci-app-opkg2": {
+		"description": "Grant access to opkg management",
+		"read": {
+			"cgi-io": [ "exec" ],
+			"file": {
+				"/usr/libexec/opkg-list installed": [ "exec" ],
+				"/usr/libexec/opkg-list available": [ "exec" ],
+				"/usr/libexec/opkg-call list-installed": [ "exec" ],
+				"/usr/libexec/opkg-call list-available": [ "exec" ],
+				"/etc/opkg.conf": [ "read" ],
+				"/etc/opkg/*.conf": [ "read" ]
+			},
+			"ubus": {
+				"luci": [ "getMountPoints" ]
+			}
+		},
+		"write": {
+			"file": {
+				"/usr/libexec/opkg-call install *": [ "exec" ],
+				"/usr/libexec/opkg-call remove *": [ "exec" ],
+				"/usr/libexec/opkg-call update *": [ "exec" ],
+				"/etc/opkg.conf": [ "write" ],
+				"/etc/opkg/*.conf": [ "write" ],
+				"/tmp/upload.ipk": [ "write" ]
+			}
+		}
+	}
+}