Add statesync example script (#417)

* Add statesync example script

* Remove setup commands and add rpc endpoint

* Remove semicolon

Co-authored-by: Mauro Lacy <maurolacy@users.noreply.github.com>

Co-authored-by: Mauro Lacy <maurolacy@users.noreply.github.com>

scripts/statesync.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Print every command.
+set -ux
+
+# Initialize chain.
+tgrade init test --chain-id tgrade-mainnet-1
+
+# Get "trust_hash" and "trust_height".
+INTERVAL=2000
+SNAP_RPC="https://rpc.mainnet-1.tgrade.confio.run:443"
+LATEST_HEIGHT=$(curl -s $SNAP_RPC/block | jq -r .result.block.header.height)
+BLOCK_HEIGHT=$(($LATEST_HEIGHT-$INTERVAL))
+TRUST_HASH=$(curl -s "$SNAP_RPC/block?height=$BLOCK_HEIGHT" | jq -r .result.block_id.hash)
+
+# Print out block and transaction hash from which to sync state.
+echo "TRUST HEIGHT: $BLOCK_HEIGHT"
+echo "TRUST HASH: $TRUST_HASH"
+
+# Export state sync variables.
+export TGRADE_STATESYNC_ENABLE=true
+export TGRADE_STATESYNC_RPC_SERVERS="$SNAP_RPC,https://tgrade-mainnet-rpc.allthatnode.com:26657"
+export TGRADE_STATESYNC_TRUST_HEIGHT=$BLOCK_HEIGHT
+export TGRADE_STATESYNC_TRUST_HASH=$TRUST_HASH
+
+# Start chain.
+tgrade start