morph: init container also mkdir /db/data + seed priv_validator_state.json

morphnode panics (open /db/data/...: no such file) without the data dir + initial
validator state. EL healthy; this unblocks the CL.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

morph/l2geth/morph-mainnet-l2geth-archive-leveldb-hash-mpt.yml

@@ -107,9 +107,10 @@ services:
     entrypoint: [/bin/sh, -c]
     command:
       - |
-        mkdir -p /db/config
+        mkdir -p /db/config /db/data
         cp -n /seed/config.toml  /db/config/config.toml
         cp -n /seed/genesis.json /db/config/genesis.json
+        [ -f /db/data/priv_validator_state.json ] || echo '{"height":"0","round":0,"step":0}' > /db/data/priv_validator_state.json
     restart: no
     networks:
       - chains