Add commit ID to about screen

app/build.gradle

@@ -121,7 +121,8 @@ task filterAbout {
         from 'src/main/templates/about.html'
         into 'src/main/assets'
         filter(ReplaceTokens, tokens: [versionname: android.defaultConfig.versionName,
-                                       versioncode: android.defaultConfig.versionCode.toString()])
+                                       versioncode: android.defaultConfig.versionCode.toString(),
+                                       commit: "git rev-parse HEAD".execute().text[0..6]])
     }
 }
 

app/src/main/templates/about.html

@@ -42,6 +42,7 @@
     <img src="logo.png" alt="Logo" width="100px" height="100px"/>
 
     <p>AntennaPod, Version @versionname@, Build @versioncode@</p>
+    <p>commit: @commit@</p>
 
     <p>Created by Daniel Oeh</p>