Add SENTRY_TUNNEL option (#4298)

Co-authored-by: Tom Moor <tom.moor@gmail.com>

server/env.ts

@@ -322,6 +322,13 @@ export class Environment {
   @IsOptional()
   public SENTRY_DSN = this.toOptionalString(process.env.SENTRY_DSN);
 
+  /**
+   * Sentry tunnel URL for bypassing ad blockers
+   */
+  @IsUrl()
+  @IsOptional()
+  public SENTRY_TUNNEL = this.toOptionalString(process.env.SENTRY_TUNNEL);
+
   /**
    * A release SHA or other identifier for Sentry.
    */