Implement spoe-auth relation interface library

CODEOWNERS

@@ -1,4 +1,2 @@
 # Ignore changelog from codeowner requests
 docs/changelog.md
-
-docs/*	@erinecon

charmcraft.yaml

@@ -56,6 +56,10 @@ requires:
   receive-ca-certs:
     interface: certificate_transfer
     description: Receive a CA certs for haproxy to trust.
+  spoe-auth:
+    interface: spoe-auth
+    description: Relation to provide authentication proxy to HAProxy.
+    limit: 1
 
 provides:
   ingress:

docs/changelog.md

@@ -10,6 +10,10 @@ Each revision is versioned by the date of the revision.
 
 - Added GitHub workflow that checks whether a pull request contains a change artifact.
 
+## 2025-11-13
+
+- Added the `spoe-auth` library and requirer/provider class implementation.
+
 ## 2025-11-12
 
 - Updated the haproxy-route library to add the `allow_http` attribute.

docs/release-notes/artifacts/pr0229.yaml

@@ -0,0 +1,15 @@
+# --- Release notes change artifact ----
+
+schema_version: 1
+changes:
+  - title: Add SPOE Auth interface library
+    author: tphan025
+    type: major
+    description: |
+      Add the `charms.haproxy.v0.spoe_auth` library to enable SPOE authentication integration.
+    urls: 
+      pr: https://github.com/canonical/haproxy-operator/pull/229
+      related_doc:
+      related_issue:
+    visibility: public
+    highlight: false