feat(os2mo): [#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.

The `environment_containing_json` does not seem to serve any purpose,
but was probably copied from an old method of templating the ConfigMap
using a for-loop instead of `toYaml`.

[1] kubernetes/kubernetes#22368

os2mo/templates/mo/deployment.yaml

@@ -104,12 +104,14 @@ spec:
             - name: CONFDB_SHOW_ORG_UNIT_BUTTON
               value: {{ .Values.sdtool.enabled | quote }}
 
-          envFrom:
-          - configMapRef:
-              name: mo-config
-          - configMapRef:
-              name: mo-json-config
-
+            {{- range $name, $value := .Values.os2mo.environment }}
+            - name: {{ $name }}
+              value: {{ $value | quote }}
+            {{- end }}
+            {{- range $name, $value := .Values.os2mo.environment_containing_json }}
+            - name: {{ $name }}
+              value: {{ $value | quote }}
+            {{- end }}
           ports:
             - containerPort: 5000
           resources:
@@ -220,9 +222,14 @@ spec:
                 secretKeyRef:
                   name: {{ .Values.database.mox.secret }}
                   key: db_password
-          envFrom:
-            - configMapRef:
-                name: mo-config
+            {{- range $name, $value := .Values.os2mo.environment }}
+            - name: {{ $name }}
+              value: {{ $value | quote }}
+            {{- end }}
+            {{- range $name, $value := .Values.os2mo.environment_containing_json }}
+            - name: {{ $name }}
+              value: {{ $value | quote }}
+            {{- end }}
           resources:
             {{- toYaml .Values.os2mo.resources | nindent 12 }}