Added invite link configuration

app/build.gradle

@@ -51,6 +51,7 @@ android {
         full {
             dimension "all"
             buildConfigField "boolean", "PLAY_STORE_RELEASE", "false"
+            buildConfigField "String", "INVITE_LINK", "\"https://email.faircode.eu/\""
             buildConfigField "String", "PRO_FEATURES", "\"https://email.faircode.eu/donate/\""
             buildConfigField "String", "GITHUB_LATEST_API", "\"https://api.github.com/repos/M66B/open-source-email/releases/latest\""
             buildConfigField "boolean", "BETA_RELEASE", "true"
@@ -58,6 +59,7 @@ android {
         play_beta {
             dimension "all"
             buildConfigField "boolean", "PLAY_STORE_RELEASE", "true"
+            buildConfigField "String", "INVITE_LINK", "\"https://play.google.com/apps/testing/eu.faircode.email\""
             buildConfigField "String", "PRO_FEATURES", "\"https://email.faircode.eu/#pro\""
             buildConfigField "String", "GITHUB_LATEST_API", "\"\""
             buildConfigField "boolean", "BETA_RELEASE", "true"
@@ -65,6 +67,7 @@ android {
         play_release {
             dimension "all"
             buildConfigField "boolean", "PLAY_STORE_RELEASE", "true"
+            buildConfigField "String", "INVITE_LINK", "\"https://play.google.com/store/apps/details?id=eu.faircode.email\""
             buildConfigField "String", "PRO_FEATURES", "\"https://email.faircode.eu/#pro\""
             buildConfigField "String", "GITHUB_LATEST_API", "\"\""
             buildConfigField "boolean", "BETA_RELEASE", "false"

app/src/main/java/eu/faircode/email/ActivityView.java

@@ -804,10 +804,14 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
     }
 
     private Intent getIntentInvite() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(getString(R.string.title_try)).append("\n\n");
+        sb.append(BuildConfig.INVITE_LINK).append("\n\n");
+
         Intent intent = new Intent(Intent.ACTION_SEND);
         intent.setType("text/plain");
         intent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.app_name));
-        intent.putExtra(Intent.EXTRA_TEXT, getString(R.string.title_try) + "\n\nhttps://email.faircode.eu/\n\n");
+        intent.putExtra(Intent.EXTRA_TEXT, sb.toString());
         return intent;
     }