allow catalog-diff to compile catalogs on the puppet compilers (#462)

catalog-diff compiles a host's catalog in two environments and diffs them to validate puppet-prod changes before merge, which means compiling catalogs on behalf of other nodes via POST /puppet/v4/catalog. The compilers run the image default auth.conf, where that endpoint is denied.

- add a compiler auth.conf allowing catalog-diff.main.unkin.net to POST /puppet/v4/catalog
- add a pre-default entrypoint script seeding it into conf.d, failing hard if the source is absent
- mount both onto the compiler deployment via configMapGenerator

Reviewed-on: #462
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

apps/base/puppet/kustomization.yaml

@@ -54,6 +54,16 @@ configMapGenerator:
       - resources/compiler/puppetdb.conf
     options:
       disableNameSuffixHash: true
+  - name: compiler-auth.conf
+    files:
+      - resources/compiler/auth.conf
+    options:
+      disableNameSuffixHash: true
+  - name: compiler-auth-conf-seed
+    files:
+      - resources/compiler/10-auth-conf.sh
+    options:
+      disableNameSuffixHash: true
   - name: additional-ruby-gems
     files:
       - resources/additional-ruby-gems.sh