Give the puppetserver compilers the Vault cert helpers (#482)

profiles::pki::vault and profiles::ssh::sign shell out to
/usr/local/bin/certmanager and /usr/local/bin/sshsignhost from generate()
during catalog compilation. Neither binary exists in the compiler image, so
every node using them fails to compile.

- install certmanager v0.2.0 and sshsignhost v0.1.0 onto the shared bin volume with sha256 verification
- wrap both at /usr/local/bin from a pre-default entrypoint hook, failing startup loudly if either is missing
- mount read-only Vault configs for both: kubernetes auth on k8s/au/syd1, internal CA verified rather than skipped

Reviewed-on: #482
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>

apps/base/puppet/resources/compiler/sshsignhost.yaml

@@ -0,0 +1,11 @@
+---
+vault:
+  addr: https://vault.service.consul:8200
+  auth_method: kubernetes
+  k8s_mount: k8s/au/syd1
+  k8s_role: puppet_sshsigner
+  jwt_path: /var/run/secrets/kubernetes.io/serviceaccount/token
+  mount_point: sshca
+  role_name: signhost
+  tls_skip_verify: false
+  timeout: 30s