Embed env_vars guidance in docs

portainer_agent/CHANGELOG.md

@@ -1,3 +1,4 @@
+- Added support for configuring extra environment variables via the `env_vars` add-on option alongside config.yaml. See https://github.com/alexbelgium/hassio-addons/wiki/Add-Environment-variables-to-your-Addon-2 for details.
 
 ## alpine-sts (24-05-2025)
 - Update to latest version from portainer/agent

portainer_agent/README.md

@@ -55,6 +55,8 @@ Disable protection mode, then from the other Portainer cluster, add a new enviro
 
 ## Configuration
 
+Use the add-on `env_vars` option to pass extra environment variables (uppercase or lowercase names). See https://github.com/alexbelgium/hassio-addons/wiki/Add-Environment-variables-to-your-Addon-2 for details.
+
 ---
 
 Main options :
@@ -67,3 +69,5 @@ Other options : see https://github.com/portainer/agent#deployment-options
 ## Support
 
 Create an issue on github
+
+

portainer_agent/config.yaml

@@ -24,7 +24,7 @@ ports_description:
   9001/tcp: Portainer agent
 schema:
   env_vars:
-    - name: match(^[A-Z0-9_]+$)
+    - name: match(^[A-Za-z0-9_]+$)
       value: str?
   AGENT_CLUSTER_ADDR: str?
   AGENT_CLUSTER_PROBE_INTERVAL: str?