Inject parity script to all dapps // Expand dapps to any ZIP file (#7260)

* Inject Parity script to all HTML dapps pages

* Small glitch

* Add injection test

* Add Special GHH commit value for serving ZIP files as DAPPS

* Refactor GithubDapp fetcher

* PR Grumbles

dapps/src/tests/fetch.rs

@@ -166,14 +166,15 @@ fn should_return_fetched_dapp_content() {
 
 	response1.assert_status("HTTP/1.1 200 OK");
 	assert_security_headers_for_embed(&response1.headers);
-	assert_eq!(
-		response1.body,
-		r#"18
+	assert!(
+		response1.body.contains(r#"18
 <h1>Hello Gavcoin!</h1>
 
 0
 
-"#
+"#),
+		"Expected Gavcoin body: {}",
+		response1.body
 	);
 
 	response2.assert_status("HTTP/1.1 200 OK");