feat(sd_changed_at): [#48311] template environment variables directly

Previously, environment variables were templated into a ConfigMap which
was referenced through an `envFrom` in the deployment. Unfortunately,
Kubernetes does not restart deployments on changes to their referenced
ConfigMaps[1], so this indirection means that deployments have to be
restarted manually every time a change is made - something that is very
easy to forget in an otherwise GitOpsy workflow.

[1] kubernetes/kubernetes#22368

os2mo/templates/integrations/sd-changed-at/deployment.yaml

@@ -91,9 +91,10 @@ spec:
                 secretKeyRef:
                   name: {{ .Values.sd_changed_at.sd_secret_name }}
                   key: sd_institution
-          envFrom:
-            - configMapRef:
-                name: sd-changed-at
+            {{- range $name, $value := .Values.sd_changed_at.environment }}
+            - name: {{ $name }}
+              value: {{ $value | quote }}
+            {{- end }}
           ports:
             - containerPort: 5000
           resources: