appdaemon: ship elco-remocon-net app via fleet ConfigMap

The app's apps.yaml block and the elco-remocon-net-appdaemon.py module
are now packaged in a ConfigMap (appdaemon-elco-app) and mounted at
/conf/apps/elco, replacing the previous workflow of kubectl cp'ing the
file onto the PVC. AppDaemon scans /conf/apps recursively, so the new
mount is picked up automatically alongside the upstream hello example
that still lives on the PVC.

The python source is embedded verbatim via a literal block in the CM
yaml; regen-elco-app-cm.py rebuilds the CM yaml from
~/elco-remocon-net-appdaemon when the upstream source changes.

Author: tillo

appdaemon/appdaemon-deploy.yml

@@ -45,10 +45,16 @@ spec:
           mountPath: /conf/secrets.yaml
           subPath: secrets.yaml
           readOnly: true
+        - name: appdaemon-elco-app
+          mountPath: /conf/apps/elco
+          readOnly: true
       volumes:
       - name: appdaemon-conf
         persistentVolumeClaim:
           claimName: appdaemon-conf
       - name: appdaemon-secrets-yaml
         secret:
           secretName: appdaemon-secrets-yaml
+      - name: appdaemon-elco-app
+        configMap:
+          name: appdaemon-elco-app