feat: mine 101 blocks right away (#17)

Co-authored-by: Fanis Michalakis <fanis.michalakis@ito.am>

docker/bitcoin-regtest/README.md

@@ -1,15 +1,16 @@
 # Bitcoin Regtest
 
 This app is a simple bitcoin regtest node with auto-mining enabled.
-The node will mine 1 block every 30 seconds
 
-You can disable the auto-mining by setting the `CRON_MINE_BTC` env variable to `false`
+The node will mine the 101 first blocks instantly right after initialization, so that at least one coinbase is [mature](https://bitcoin.stackexchange.com/questions/1991/what-is-the-block-maturation-time) from the get go. Then, it will automatically mine 1 new block every 30 seconds.
+
+You can disable the auto-mining by setting the `CRON_MINE_BTC` env variable to `false`. Note that it also disables the mining of the first 101 blocks.
 
 The bitcoin node rpc is listening on port `18443`, to connect to the rpc use `satoshi` as username and `satoshi` as password
 The zmq port are `28334` for raw blocks and `28335` for raw transactions
 
 You can use the `mine` command to mine a specific amount of blocks
 
 ```bash
-docker exec -it bitcoin-regtest mine 10
+docker exec -it bitcoin-regtest mine -b 10
 ```

docker/bitcoin-regtest/entrypoint.sh

@@ -14,8 +14,9 @@ create_and_load_wallet() {
     bitcoin-cli -regtest loadwallet satoshi 2>/dev/null | true
 }
 
-# Mine blocks every 30 seconds
+# Mine 1 block every 30 seconds
 mine_btc() {
+    sleep 5 && mine -b 101
     while true; do
         sleep $MININING_INTERVAL && mine
     done