make GA code configurable

Signed-off-by: MiniDigger <admin@minidigger.me>

src/main/java/io/papermc/hangar/config/hangar/HangarConfig.java

@@ -30,6 +30,7 @@ public class HangarConfig {
     private final ApplicationHome home = new ApplicationHome(HangarApplication.class);
     private String pluginUploadDir = home.getDir().toPath().resolve("work").toString();
     private String baseUrl = "https://localhost:8080";
+    private String gaCode = "";
 
     @NestedConfigurationProperty
     public final FakeUserConfig fakeUser;
@@ -191,6 +192,14 @@ public class HangarConfig {
         this.baseUrl = baseUrl;
     }
 
+    public String getGaCode() {
+        return gaCode;
+    }
+
+    public void setGaCode(String gaCode) {
+        this.gaCode = gaCode;
+    }
+
     public void checkDebug() {
         if (!debug) {
             throw new UnsupportedOperationException("this function is supported in debug mode only");

src/main/resources/application.yml

@@ -49,6 +49,7 @@ hangar:
   auth-url: "http://localhost:8000"
   base-url: "http://localhost:8080"
   use-webpack: true
+  ga-code: "UA-38006759-9"
 
   sponsors:
     - name: Beer

src/main/resources/templates/layout/base.ftlh

@@ -51,13 +51,13 @@ showFooter: Boolean = true, noContainer: Boolean = false, additionalMeta: Html =
         <meta name="theme-color" content="#2980B9">
 
         <#-- google foo -->
-        <script async src="https://www.googletagmanager.com/gtag/js?id=UA-38006759-9"></script>
+        <script async src="https://www.googletagmanager.com/gtag/js?id=${config.gaCode}"></script>
         <script>
             window.dataLayer = window.dataLayer || [];
             function gtag(){dataLayer.push(arguments);}
             gtag('js', new Date());
 
-            gtag('config', 'UA-38006759-9');
+            gtag('config', '${config.gaCode}');
         </script>
         <script type="application/ld+json">
             {