chore(updatecli): add OpenVPN certificate inventory manifest (#499)

* chore(updatecli): add OpenVPN certificate inventory manifest

Signed-off-by: jayfranco999 <jaideepfrancis999@gmail.com>

* fixup

Signed-off-by: jayfranco999 <jaideepfrancis999@gmail.com>

* fixup

Signed-off-by: jayfranco999 <jaideepfrancis999@gmail.com>

* fixup

Signed-off-by: jayfranco999 <jaideepfrancis999@gmail.com>

* remove `vpn` and `updatecli` labels

---------

Signed-off-by: jayfranco999 <jaideepfrancis999@gmail.com>
Co-authored-by: Damien Duportal <damien.duportal@gmail.com>
Co-authored-by: Hervé Le Meur <91831478+lemeurherve@users.noreply.github.com>

Author: 3 people

updatecli/updatecli.d/openvpn-cert-inventory.tpl

@@ -0,0 +1,50 @@
+---
+name: "Sync OpenVPN certificate inventory from cert/pki/issued"
+scms:
+  default:
+    kind: github
+    spec:
+      user: "{{ .github.user }}"
+      email: "{{ .github.email }}"
+      owner: "{{ .github.owner }}"
+      repository: "{{ .github.repository }}"
+      token: "{{ requiredEnv .github.token }}"
+      branch: "{{ .github.branch }}"
+
+sources:
+  certificatesList:
+    name: "Discover OpenVPN certificate usernames"
+    kind: shell
+    spec:
+      command: |
+        set -eu
+        for cert in cert/pki/issued/*.crt; do
+          [ -e "$cert" ] || continue
+          basename "$cert" .crt
+        done | sort | paste -sd "," -
+
+targets:
+  updateCertificates:
+    name: "Update certificate inventory in updatecli/values.yaml"
+    kind: yaml
+    sourceid: certificatesList
+    spec:
+      file: updatecli/values.yaml
+      key: $.certificates
+    scmid: default
+
+actions:
+  default:
+    kind: github/pullrequest
+    scmid: default
+    spec:
+      draft: true
+      title: "chore(updatecli): sync OpenVPN certificate inventory"
+      description: |
+        This PR synchronizes the OpenVPN certificate inventory from the
+        contents of `cert/pki/issued/`.
+        
+        **Certificates discovered:**
+        {{- range $cert := splitList "," (source "certificatesList") }}
+        - `{{ $cert }}`
+        {{- end }}