feat(ops/www): add experimental grep.tvl.fyi setup

This points a reverse proxy at a manually run, highly experimental
container. The actual setup is not yet nixified.

Change-Id: I8e1d5ec94a3f1e9b4b0bfc7ffd2a9badf4e79291
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9577
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Autosubmit: tazjin <tazjin@tvl.su>

ops/modules/www/grep.tvl.fyi.nix

@@ -0,0 +1,22 @@
+# Experimental configuration for manually Livegrep.
+{ config, ... }:
+
+{
+  imports = [
+    ./base.nix
+  ];
+
+  config = {
+    # Short link support (i.e. plain http://at) for users with a
+    # configured tvl.fyi/tvl.su search domain.
+    services.nginx.virtualHosts."grep.tvl.fyi" = {
+      enableACME = true;
+      forceSSL = true;
+
+      locations."/" = {
+        # experimental: manually run Docker container
+        proxyPass = "http://172.17.0.3:8910";
+      };
+    };
+  };
+}