Enable volumes in the theodolite script

Add persistenVolume and persistentVolumeClaim to have a persistent
storage for the resulst of the theodolite job.

execution/infrastructure/kubernetes/volume.yaml

+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: theodolite-pv-volume
+  labels:
+    type: local
+spec:
+  storageClassName: theodolite
+  capacity:
+    storage: 100m
+  accessModes:
+    - ReadWriteOnce
+  hostPath:
+    path: "</your/path/to/results/folder>"
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: theodolite-pv-claim
+spec:
+  storageClassName: theodolite
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 100m

execution/theodolite.yaml

@@ -5,6 +5,10 @@ metadata:
 spec:
   template:
     spec:
+      volumes:
+      - name: theodolite-pv-storage
+        persistentVolumeClaim:
+          claimName: theodolite-pv-claim
       containers:
         - name: theodolite
           image: bvonheid/theodolite:latest
@@ -32,8 +36,13 @@ spec:
               value: "http://prometheus-operated:9090"
             # - name: NAMESPACE
             #   value: "default"
+            - name: RESULT_PATH
+              value: "results"
             - name: PYTHONUNBUFFERED
               value: "1"
+          volumeMounts:
+            - mountPath: "/app/results"
+              name: theodolite-pv-storage
       restartPolicy: Never
   backoffLimit: 4