Add containerized pre-commit hook

Author: lhriley

.pre-commit-hooks.yaml

@@ -15,3 +15,12 @@
   language: golang
   name: Helm Docs Built
   require_serial: true
+
+- id: helm-docs-container
+  args: []
+  description: Uses the container image of 'helm-docs' to create documentation from the Helm chart's 'values.yaml' file, and inserts the result into a corresponding 'README.md' file.
+  entry: jnorwood/helm-docs:latest
+  files: (README\.md\.gotmpl|(Chart|requirements|values)\.yaml)$
+  language: docker_image
+  name: Helm Docs Container
+  require_serial: true