chore: add ossf plugin

Signed-off-by: Ben McNicholl <git@benmcnicholl.com>

Author: mcncl

.buildkite/pipeline.yml

@@ -16,7 +16,17 @@ steps:
     plugins:
       - plugin-tester#v1.2.0: ~
 
-  - wait
+  - label: "Security Scan"
+    key: security_scan
+    plugins:
+      - secrets#v1.0.0:
+          variables:
+            GITHUB_TOKEN: GITHUB_TOKEN
+      - ossf-scorecard#v1.0.0:
+          github_token: $$GITHUB_TOKEN
+
+  - wait: ~
+
   - label: run the plugin
     command: "echo hello world"
     plugins: