fix(renovate): Switch to ephemeral volume

This patch adjusts the cache volume to an ephemeral volume, which should
make sure that the cache is always invalidated after a full run.

apps/base/renovate/release.yaml

@@ -51,8 +51,14 @@ data:
       create: true
     extraVolumes:
       - name: cache
-        persistentVolumeClaim:
-          claimName: renovate-cache
+        ephemeral:
+          volumeClaimTemplate:
+            spec:
+              accessModes:
+                - ReadWriteOnce
+              resources:
+                requests:
+                  storage: 5Gi
     extraVolumeMounts:
       - name: cache
         mountPath: /cache
@@ -70,16 +76,3 @@ data:
       limits:
         cpu: 1000m
         memory: 2Gi
----
-apiVersion: v1
-kind: PersistentVolumeClaim
-metadata:
-  name: renovate-cache
-  namespace: renovate
-spec:
-  accessModes:
-  - ReadWriteOnce
-  resources:
-    requests:
-      storage: 5Gi
-  volumeMode: Filesystem