fix: add prysm-multiarch upstream image (#451)

.github/tests/dencun-devnet-12.yaml

@@ -6,7 +6,7 @@ participants:
   - el_client_type: nethermind
     el_client_image: ethpandaops/nethermind:master
     cl_client_type: prysm
-    cl_client_image: ethpandaops/prysm:develop,ethpandaops/prysm-validator:develop
+    cl_client_image: gcr.io/prysmaticlabs/prysm/beacon-chain:latest,gcr.io/prysmaticlabs/prysm/validator:latest
   - el_client_type: erigon
     el_client_image: ethpandaops/erigon:devel
     cl_client_type: nimbus

src/package_io/input_parser.star

@@ -17,7 +17,7 @@ DEFAULT_CL_IMAGES = {
     "lighthouse": "sigp/lighthouse:latest",
     "teku": "consensys/teku:latest",
     "nimbus": "statusim/nimbus-eth2:multiarch-latest",
-    "prysm": "prysmaticlabs/prysm-beacon-chain:latest,prysmaticlabs/prysm-validator:latest",
+    "prysm": "gcr.io/prysmaticlabs/prysm/beacon-chain:latest,gcr.io/prysmaticlabs/prysm/validator:latest",
     "lodestar": "chainsafe/lodestar:latest",
 }