feat(randomness): make .env backup

Author: GabrielMartinezRodriguez

apps/randomness/start-local-randomness.sh

@@ -155,6 +155,14 @@ fi
 rm -rf logs
 mkdir logs
 
+if [[ -f ".env.bak" ]]; then
+    echo "Error: Backup file '.env.bak' already exists. Refusing to overwrite your existing backup."
+    exit 1
+else
+    cp .env .env.bak
+    echo "Backup created: '.env.bak'"
+fi
+
 echo "Starting Anvil..."
 anvil --block-time $BLOCK_TIME --port $ANVIL_RPC_PORT > "$SCRIPT_DIR/logs/anvil.log" 2>&1 &
 ANVIL_PID=$!

contracts/src/Randomness/Random.sol

@@ -12,6 +12,7 @@ contract Random is RandomCommitment, Drand {
     * will be posted on a block with timestamp T (even if such a block exists) because of network delays.
     */
     uint256 public constant DRAND_DELAY_SECONDS = 2;
+
     /**
      * The minimum amount of time (in seconds) that commitments to future Drand randomness must be made
      * in advance. This delay is relative to Drand timestamp (so DRAND_DELAY must also be added).