use git commit hash verification when replaying archived games (#204)

src/core/configuration/Config.ts

@@ -100,6 +100,8 @@ export interface ServerConfig {
   env(): GameEnv;
   adminToken(): string;
   adminHeader(): string;
+  // Only available on the server
+  gitCommit(): string;
 }
 
 export interface Config {

src/core/configuration/DefaultConfig.ts

@@ -22,6 +22,9 @@ import { pastelTheme } from "./PastelTheme";
 import { pastelThemeDark } from "./PastelThemeDark";
 
 export abstract class DefaultServerConfig implements ServerConfig {
+  gitCommit(): string {
+    return process.env.GIT_COMMIT;
+  }
   adminHeader(): string {
     return "x-admin-key";
   }

src/core/configuration/DevConfig.ts

@@ -23,6 +23,9 @@ export class DevServerConfig extends DefaultServerConfig {
   numWorkers(): number {
     return 2;
   }
+  gitCommit(): string {
+    return "DEV";
+  }
 }
 
 export class DevConfig extends DefaultConfig {