Add volume claim for OCI plus access pod

Volume definition and an access pod are added. Open points are:

• Pod should be converted to a deployment (or restarted on failure, see #132)
• Some documentation should be added

Fixes #128 (closed)

execution/infrastructure/kubernetes/volume-oci-access.yaml

+apiVersion: v1
+kind: Pod
+metadata:
+  name: theodolite-results-access
+spec:
+  restartPolicy: Always
+  containers:
+  - name: theodolite-results-access
+    image: busybox:latest
+    command:
+    - sh
+    - -c
+    - exec tail -f /dev/null
+    volumeMounts:
+    - mountPath: /app/results
+      name: theodolite-pv-storage
+  volumes:
+    - name: theodolite-pv-storage
+      persistentVolumeClaim:
+        claimName: theodolite-pv-claim