Include prettier into pre-commit hooks

- Use existing yarn setup for calling prettier
  - Run with --write to replicate linting script behaviour
  - Will run in parallel to existing linting script in ci for evaluation
    purposes

Author: TheOneFromNorway

.pre-commit-config.yaml

@@ -4,3 +4,12 @@ repos:
     hooks:
       - id: terraform_fmt
         files: \.(tf|tfvars|hcl)$
+  - repo: local
+    hooks:
+      - id: prettier
+        name: Prettier
+        entry: |
+          yarn prettier --write --ignore-unknown
+        language: system
+#        pass_filenames: false
+#        stages: [manual]