Include agenix module and package directly

Avoids adding an extra flake input only to fetch a single module and
package.

Reviewed-by: Aleix Boné <abonerib@bsc.es>
Tested-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>

pkgs/agenix/update.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -e
+
+# All operations are done relative to root
+GITROOT=$(git rev-parse --show-toplevel)
+cd "$GITROOT"
+
+REVISION=${1:-main}
+
+TMPCLONE=$(mktemp -d)
+trap "rm -rf ${TMPCLONE}" EXIT
+
+git clone https://github.com/ryantm/agenix.git --revision="$REVISION" "$TMPCLONE" --depth=1
+
+cp "${TMPCLONE}/pkgs/agenix.sh" pkgs/agenix/agenix.sh
+cp "${TMPCLONE}/pkgs/agenix.nix" pkgs/agenix/default.nix
+sed -i 's#../example#./example#' pkgs/agenix/default.nix
+
+cp "${TMPCLONE}/example/"* pkgs/agenix/example/
+cp "${TMPCLONE}/example_keys/"* pkgs/agenix/example_keys/
+
+cp "${TMPCLONE}/modules/age.nix" m/module/agenix.nix