feat(users/flokli/nixon-2024): init

Change-Id: I547a5504f6782169dd7280c0b5c21cbe66068a2e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12682
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: flokli <flokli@flokli.de>

users/flokli/presentations/2024-10-25-nixcon-tvix/default.nix

@@ -0,0 +1,35 @@
+{ depot, pkgs, ... }:
+
+let
+  inherit (pkgs)
+    fontconfig qrencode runCommand stdenv;
+  mkQr = url: runCommand "qrcode.png" { } ''
+    ${qrencode}/bin/qrencode -o $out -t SVG -s 5 \
+      --background=fafafa \
+      --foreground=000000 \
+      ${url}
+  '';
+in
+stdenv.mkDerivation {
+  name = "2024-nixcon-tvix";
+  src = ./.;
+
+  FONTCONFIG_FILE = pkgs.makeFontsConf {
+    fontDirectories = with pkgs; [ jetbrains-mono fira fira-code fira-mono lato ];
+  };
+
+  PUPPETEER_EXECUTABLE_PATH = "${pkgs.chromium}/bin/chromium";
+  PUPPETEER_SKIP_CHROMIUM_DOWNLOAD = "1";
+
+  nativeBuildInputs = [ pkgs.reveal-md pkgs.graphviz ];
+
+  buildPhase = ''
+    cp ${depot.tvix.logo}/logo.png tvix-logo.png
+    cp ${mkQr "https://flokli.de"} qrcode-flokli.svg
+    cp ${mkQr "https://tvix.dev"} qrcode-tvix.svg
+
+    mkdir -p $out
+    reveal-md --static $out presentation.md
+    reveal-md --print $out/slides.pdf presentation.md
+  '';
+}