Add reuse lint to CI and pre-commit hook

The ruse tool is available in many distros[1] and can also be installed
via pip on other distros (e.g. Ubuntu).

Example results from github:

    =====  mdl  =====

    =====  shellcheck  =====

    =====  yamllint  =====

    =====  reuse  =====
    # SUMMARY

    * Bad licenses:
    * Deprecated licenses:
    * Licenses without file extension:
    * Missing licenses:
    * Unused licenses:
    * Used licenses: Apache-2.0, CC0-1.0
    * Read errors: 0
    * Files with copyright information: 238 / 238
    * Files with license information: 238 / 238

    Congratulations! Your project is compliant with version 3.0 of the REUSE Specification :-)

[1] https://git.fsfe.org/reuse/tool#installation-via-package-managers-recommended

Signed-off-by: Nir Soffer <[email protected]>

.github/workflows/sanity.yml

@@ -39,7 +39,7 @@ jobs:
           sudo apt-get update
           sudo DEBIAN_FRONTEND=noninteractive apt-get install -y python3-pip ruby
           sudo gem install mdl
-          sudo pip3 install yamllint
+          sudo pip3 install yamllint reuse
 
       - name: Run linters
         run: ./hack/pre-commit.sh

hack/pre-commit.sh

@@ -48,4 +48,9 @@ run_check '.*\.(ba)?sh' shellcheck
 # Install via: dnf install yamllint
 run_check '.*\.ya?ml' yamllint -s -c "${scriptdir}/yamlconfig.yaml"
 
+# reuse: https://git.fsfe.org/reuse/tool
+# Install via: dnf install reuse
+echo "=====  reuse  ====="
+reuse lint
+
 (! < "${OUTPUTS_FILE}" read -r)