gomuks-web: add update script

pkgs/by-name/go/gomuks-web/package.nix

@@ -75,9 +75,7 @@ buildGoModule (finalAttrs: {
     mv $out/bin/gomuks $out/bin/gomuks-web
   '';
 
-  passthru.updateScript = {
-    inherit (finalAttrs) frontend;
-  };
+  passthru.updateScript = ./update.sh;
 
   meta = {
     mainProgram = "gomuks-web";

pkgs/by-name/go/gomuks-web/update.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl jq nix-update
+
+set -euo pipefail
+
+# Fetch latest release infor
+RELEASE=$(curl -sSL https://api.github.com/repos/tulir/gomuks/releases/latest | jq -r .name)
+
+if [ -z "$RELEASE" ]; then
+    echo "Failed to fetch latest release"
+    exit 1
+fi
+
+# Strip leading v from version
+VERSION="${RELEASE#v}"
+
+# Debug
+echo "Release ${RELEASE} -> Version ${VERSION}"
+
+nix-update --build --commit --version "${VERSION}" gomuks-web