authentik: migrate to envFrom with per-container InfisicalSecrets

Server and worker share one Secret since their env is byte-identical. Database and SMTP values are Infisical references rather than copies.

applications/authentik/postgres/authentik-postgres-statefulset.yaml

@@ -19,24 +19,9 @@ spec:
           image: postgres:16-alpine
           ports:
             - containerPort: 5432
-          env:
-            - name: POSTGRES_DB
-              valueFrom:
-                secretKeyRef:
-                  name: authentik-secrets
-                  key: db_name
-            - name: POSTGRES_USER
-              valueFrom:
-                secretKeyRef:
-                  name: authentik-secrets
-                  key: db_user
-            - name: POSTGRES_PASSWORD
-              valueFrom:
-                secretKeyRef:
-                  name: authentik-secrets
-                  key: db_password
-            - name: PGDATA
-              value: /var/lib/postgresql/data/pgdata
+          envFrom:
+            - secretRef:
+                name: authentik-postgres-secrets
           volumeMounts:
             - name: data
               mountPath: /var/lib/postgresql/data