netbox: send a Host header on the probes

The kubelet probes the pod IP, which Django rejects with a 400 because
ALLOWED_HOSTS is netbox.jsme.be. Setting the Host header keeps
ALLOWED_HOSTS tight instead of widening it to '*'.

applications/netbox/netbox/deployment.yaml

@@ -50,6 +50,10 @@ spec:
             httpGet:
               path: /login/
               port: 8080
+              # Django rejects the pod IP as a Host header (ALLOWED_HOSTS).
+              httpHeaders:
+                - name: Host
+                  value: netbox.jsme.be
             periodSeconds: 10
             # Generous: the entrypoint runs migrations before granian binds.
             failureThreshold: 60
@@ -57,11 +61,19 @@ spec:
             httpGet:
               path: /login/
               port: 8080
+              # Django rejects the pod IP as a Host header (ALLOWED_HOSTS).
+              httpHeaders:
+                - name: Host
+                  value: netbox.jsme.be
             periodSeconds: 15
           livenessProbe:
             httpGet:
               path: /login/
               port: 8080
+              # Django rejects the pod IP as a Host header (ALLOWED_HOSTS).
+              httpHeaders:
+                - name: Host
+                  value: netbox.jsme.be
             periodSeconds: 30
             failureThreshold: 5
       volumes: