try

cluster/apps/invidious/invidious.yml

@@ -21,32 +21,17 @@ spec:
         - name: INVIDIOUS_CONFIG
           value: |
             db:
-              dbname: $(POSTGRES_DB)
-              user: $(POSTGRES_USER)
-              password: $(POSTGRES_PASSWORD)
-              host: invidious-db
+              dbname: "${POSTGRES_DB}"
+              user: "${POSTGRES_USER}"
+              password: "${POSTGRES_PASSWORD}"
+              host: "invidious-db"
               port: 5432
             check_tables: true
             invidious_companion:
             - private_url: "http://companion:8282"
               public_url: "http://localhost:8282"
-            invidious_companion_key: $(COMPANION_KEY)
-            hmac_key: $(HMAC_KEY)
-        - name: POSTGRES_USER
-          valueFrom:
-            secretKeyRef:
-              name: invidious-db-secrets
-              key: postgres-user
-        - name: POSTGRES_PASSWORD
-          valueFrom:
-            secretKeyRef:
-              name: invidious-db-secrets
-              key: postgres-password
-        - name: POSTGRES_DB
-          valueFrom:
-            secretKeyRef:
-              name: invidious-db-secrets
-              key: postgres-db
+            invidious_companion_key: "${COMPANION_KEY}"
+            hmac_key: "${HMAC_KEY}"
         envFrom:
         - secretRef:
             name: invidious-db-secrets