Add licenses plugin (#118)

source/plugins/licenses/tests.yml

@@ -0,0 +1,13 @@
+- name: Licenses plugin (complete)
+  uses: lowlighter/metrics@latest
+  with:
+    token: MOCKED_TOKEN
+    template: repository
+    query: '{"repo":"metrics"}'
+    plugin_licenses: yes
+    plugin_licenses_setup: npm ci
+    plugin_licenses_ratio: yes
+    plugin_licenses_legal: yes
+  timeout: 1200000
+  modes:
+    - action