Update init script to use existing genesis file (#47)

Part of [laconicd testnet validator enrollment](https://www.notion.so/laconicd-testnet-validator-enrollment-6fc1d3cafcc64fef8c5ed3affa27c675)

Co-authored-by: Adw8 <adwaitgharpure@gmail.com>
Reviewed-on: cerc-io/laconicd#47

scripts/init.sh

@@ -6,6 +6,8 @@ MONIKER="localtestnet"
 KEYRING="test"
 LOGLEVEL="${LOGLEVEL:-info}"
 
+input_genesis_file=${GENESIS_FILE}
+
 if [ "$1" == "clean" ] || [ ! -d "$HOME/.laconicd/data/blockstore.db" ]; then
   # validate dependencies are installed
   command -v jq > /dev/null 2>&1 || {
@@ -29,6 +31,11 @@ if [ "$1" == "clean" ] || [ ! -d "$HOME/.laconicd/data/blockstore.db" ]; then
   # Set moniker and chain-id for Ethermint (Moniker can be anything, chain-id must be an integer)
   laconicd init $MONIKER --chain-id $CHAINID --default-denom alnt
 
+  if [ -f ${input_genesis_file} ]; then
+    # Use provided genesis config
+    cp $input_genesis_file $HOME/.laconicd/config/genesis.json
+  fi
+
   update_genesis() {
     jq "$1" $HOME/.laconicd/config/genesis.json > $HOME/.laconicd/config/tmp_genesis.json &&
       mv $HOME/.laconicd/config/tmp_genesis.json $HOME/.laconicd/config/genesis.json