fix: mount pelican-data PVC at /pelican-data with init container for permissions

deployments/pelican/deployment.yaml

@@ -21,6 +21,13 @@ spec:
         app.kubernetes.io/name: pelican
         app.kubernetes.io/component: panel
     spec:
+      initContainers:
+        - name: fix-perms
+          image: busybox
+          command: ["sh", "-c", "chown -R 82:82 /pelican-data && chmod -R 770 /pelican-data"]
+          volumeMounts:
+            - name: data
+              mountPath: /pelican-data
       containers:
         - name: panel
           image: ghcr.io/pelican-dev/panel:latest
@@ -84,3 +91,10 @@ spec:
               value: file
             - name: SESSION_DRIVER
               value: file
+          volumeMounts:
+            - name: data
+              mountPath: /pelican-data
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: pelican-data