fix(signal-processing): Correctly template namespace in notebook

Author: Techassi

stacks/signal-processing/jupyterhub.yaml

@@ -54,6 +54,11 @@ options:
     initContainers:
       - name: download-notebook
         image: oci.stackable.tech/sdp/tools:1.0.0-stackable0.0.0-dev
+        env:
+          - name: NAMESPACE
+            valueFrom:
+              fieldRef:
+                fieldPath: metadata.namespace
         # This file path needs adjustment for versioned demos on release branch
         command: ['sh', '-c', 'curl https://raw.githubusercontent.com/stackabletech/demos/main/stacks/signal-processing/tsdb.ipynb -o /notebook/tsdb.ipynb']
         volumeMounts:

stacks/signal-processing/tsdb.ipynb

@@ -68,7 +68,10 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "engine = sqlalchemy.create_engine(\"postgresql://admin:adminadmin@postgresql-timescaledb.{{ NAMESPACE }}.svc.cluster.local:5432/tsdb\")\n",
+    "import os\n",
+    "namespace = os.environ.get('NAMESPACE', \"default\")\n",
+    "\n",
+    "engine = sqlalchemy.create_engine(f\"postgresql://admin:adminadmin@postgresql-timescaledb.{namespace}.svc.cluster.local:5432/tsdb\")\n",
     "last_time = \"1970-01-01\"\n",
     "cols = ['r1', 'r2', 'r3', 'r4', 'r5', 'r6', 'r7', 'r8', 'r9', 'r10', 'r11', 'r12', 'r13', 'r14']"
    ]