Add /relay-data mount to transfer container

[skunert]

In paritytech/cumulus#1909 we are trying to add a zombienet test for parachain warp sync, which contains parachain snapshots.

CI fails on this test: https://gitlab.parity.io/parity/mirrors/cumulus/-/jobs/2367758

My knowledge about our CI/kubernetes setup is pretty limited. It looks like we are unable to extract the relay-data folder from db.tgz. I think the solution is to add a /relay-data mount to the transfer container.

Error:  	 Error: Command failed with exit code 1: kubectl --kubeconfig /home/nonroot/.kube/config --namespace zombie-ebc43732f106b962c56454c20f46b914 exec dave-1 -c transfer-files-container -- ash -c mkdir -p /data/ && wget https://storage.googleapis.com/zombienet-db-snaps/cumulus/0007-full_node_warp_sync/parachain-587c1ed24ddd7de05c237cf7c158fff53b8f5b26.tgz -O /data/db.tgz && cd / && tar -xzvf /data/db.tgz
I0208 16:09:04.671310    1366 log.go:198] (0xc0000fc000) (0xc000656a00) Create stream
I0208 16:09:04.671526    1366 log.go:198] (0xc0000fc000) (0xc000656a00) Stream added, broadcasting: 1
I0208 16:09:04.679650    1366 log.go:198] (0xc0000fc000) Reply frame received for 1
I0208 16:09:04.679724    1366 log.go:198] (0xc0000fc000) (0xc000656000) Create stream
I0208 16:09:04.679740    1366 log.go:198] (0xc0000fc000) (0xc000656000) Stream added, broadcasting: 3
I0208 16:09:04.684539    1366 log.go:198] (0xc0000fc000) Reply frame received for 3
I0208 16:09:04.684611    1366 log.go:198] (0xc0000fc000) (0xc000204000) Create stream
I0208 16:09:04.684628    1366 log.go:198] (0xc0000fc000) (0xc000204000) Stream added, broadcasting: 5
I0208 16:09:04.6[884](https://gitlab.parity.io/parity/mirrors/cumulus/-/jobs/2367758#L884)89    1366 log.go:198] (0xc0000fc000) Reply frame received for 5
I0208 16:09:04.727763    1366 log.go:198] (0xc0000fc000) Data frame received for 5
I0208 16:09:04.727812    1366 log.go:198] (0xc000204000) (5) Data frame handling
I0208 16:09:04.727843    1366 log.go:198] (0xc000204000) (5) Data frame sent
Connecting to storage.googleapis.com (142.250.185.144:443)
I0208 16:09:04.866445    1366 log.go:198] (0xc0000fc000) Data frame received for 5
I0208 16:09:04.866497    1366 log.go:198] (0xc000204000) (5) Data frame handling
I0208 16:09:04.866511    1366 log.go:198] (0xc000204000) (5) Data frame sent
saving to '/data/db.tgz'
I0208 16:09:05.110526    1366 log.go:198] (0xc0000fc000) Data frame received for 5
I0208 16:09:05.110579    1366 log.go:198] (0xc000204000) (5) Data frame handling
I0208 16:09:05.110594    1366 log.go:198] (0xc000204000) (5) Data frame sent
db.tgz               100% |********************************| 39.5M  0:00:00 ETA
'/data/db.tgz' saved
I0208 16:09:05.110861    1366 log.go:198] (0xc0000fc000) Data frame received for 3
I0208 16:09:05.110897    1366 log.go:198] (0xc000656000) (3) Data frame handling
I0208 16:09:05.110926    1366 log.go:198] (0xc000656000) (3) Data frame sent
I0208 16:09:05.241940    1366 log.go:198] (0xc0000fc000) Data frame received for 3
I0208 16:09:05.242006    1366 log.go:198] (0xc000656000) (3) Data frame handling
I0208 16:09:05.242037    1366 log.go:198] (0xc000656000) (3) Data frame sent
I0208 16:09:05.262202    1366 log.go:198] (0xc0000fc000) Data frame received for 3
I0208 16:09:05.262283    1366 log.go:198] (0xc000656000) (3) Data frame handling
I0208 16:09:05.262298    1366 log.go:198] (0xc000656000) (3) Data frame sent
I0208 16:09:05.262348    1366 log.go:198] (0xc0000fc000) Data frame received for 5
I0208 16:09:05.262434    1366 log.go:198] (0xc000204000) (5) Data frame handling
I0208 16:09:05.262461    1366 log.go:198] (0xc000204000) (5) Data frame sent
I0208 16:09:05.262475    1366 log.go:198] (0xc0000fc000) Data frame received for 5
tar: can't make dir relay-data: Permission denied
I0208 16:09:05.262504    1366 log.go:198] (0xc0000fc000) Data frame received for 3
I0208 16:09:05.262555    1366 log.go:198] (0xc000656000) (3) Data frame handling
I0208 16:09:05.262569    1366 log.go:198] (0xc000656000) (3) Data frame sent
I0208 16:09:05.262590    1366 log.go:198] (0xc000204000) (5) Data frame handling
I0208 16:09:05.262603    1366 log.go:198] (0xc000204000) (5) Data frame sent
I0208 16:09:05.262613    1366 log.go:198] (0xc0000fc000) Data frame received for 5
I0208 16:09:05.262623    1366 log.go:198] (0xc000204000) (5) Data frame handling
tar: can't create directory 'relay-data': Permission denied
tar: can't make dir relay-data/chains: No such file or directory
tar: can't create directory 'relay-data/': Permission denied
tar: can't make dir relay-data/: Permission denied
tar: can't create directory 'relay-data/': Permission denied
tar: can't make dir relay-data/: Permission denied
tar: can't create directory 'relay-data/': Permission denied
tar: can't make dir relay-data/: Permission denied
I0208 16:09:05.262651    1366 log.go:198] (0xc000204000) (5) Data frame sent
I0208 16:09:05.262661    1366 log.go:198] (0xc0000fc000) Data frame received for 5
I0208 16:09:05.262672    1366 log.go:198] (0xc000204000) (5) Data frame handling
I0208 16:09:05.262681    1366 log.go:198] (0xc000204000) (5) Data frame sent
tar: can't create directory 'relay-data/': Permission denied
tar: can't open 'relay-data/': Is a directory
I0208 16:09:05.262947    1366 log.go:198] (0xc0000fc000) Data frame received for 5
I0208 16:09:05.263151    1366 log.go:198] (0xc000204000) (5) Data frame handling
I0208 16:09:05.263205    1366 log.go:198] (0xc0000fc000) Data frame received for 3
I0208 16:09:05.263219    1366 log.go:198] (0xc000656000) (3) Data frame handling
I0208 16:09:05.263229    1366 log.go:198] (0xc000656000) (3) Data frame sent
I0208 16:09:05.263271    1366 log.go:198] (0xc0000fc000) Data frame received for 3
I0208 16:09:05.263307    1366 log.go:198] (0xc000656000) (3) Data frame handling
I0208 16:09:05.264762    1366 log.go:198] (0xc0000fc000) Data frame received for 1
I0208 16:09:05.264796    1366 log.go:198] (0xc000656a00) (1) Data frame handling
I0208 16:09:05.264809    1366 log.go:198] (0xc000656a00) (1) Data frame sent
I0208 16:09:05.264[886](https://gitlab.parity.io/parity/mirrors/cumulus/-/jobs/2367758#L886)    1366 log.go:198] (0xc0000fc000) (0xc000656a00) Stream removed, broadcasting: 1
I0208 16:09:05.264[944](https://gitlab.parity.io/parity/mirrors/cumulus/-/jobs/2367758#L944)    1366 log.go:198] (0xc0000fc000) Go away received
I0208 16:09:05.265413    1366 log.go:198] (0xc0000fc000) (0xc000656a00) Stream removed, broadcasting: 1
I0208 16:09:05.265441    1366 log.go:198] (0xc0000fc000) (0xc000656000) Stream removed, broadcasting: 3
I0208 16:09:05.265453    1366 log.go:198] (0xc0000fc000) (0xc000204000) Stream removed, broadcasting: 5
command terminated with exit code 1

[pepoviola]

Thanks!!