chore: configure pre-commit as git hook

.pre-commit-config.yaml

@@ -0,0 +1,9 @@
+# SPDX-FileCopyrightText: 2022 Sarah Vaupel <sarah.vaupel@ifi.lmu.de>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+repos:
+  - repo: https://github.com/fsfe/reuse-tool
+    rev: v1.0.0
+    hooks:
+      - id: reuse

shell.nix

@@ -77,7 +77,7 @@ in pkgs.mkShell {
   nativeBuildInputs = [develop inDevelop killallUni2work diffRunning]
   ++ (with pkgs;
       [ nodejs-14_x postgresql_12 openldap google-chrome exiftool memcached minio minio-client                        
-        gup skopeo
+        gup skopeo reuse pre-commit
         # busybox # for print services, but interferes with build commands in develop-shell
         htop
         pdftk #pdftk just for testing pdf-passwords