Add instructions to bridge funds on L2

ops/deployments-from-scratch.md

@@ -106,6 +106,55 @@
     LANG=en_US.utf8 ansible-playbook -i localhost, --connection=local run-optimism.yml --extra-vars='{"target_host" : "localhost", "skip_container_build": true}' -kK --user $USER
     ```
 
+* Bridge funds on L2:
+
+  * Set the following variables:
+
+    ```bash
+    cd /srv/op-sepolia
+
+    L1_RPC=http://host.docker.internal:8545
+    L2_RPC=http://host.docker.internal:9545
+
+    NETWORK=<the network name found above>
+
+    DEPLOYMENT_CONTEXT=11155111
+    ACCOUNT=<admin-account-address>
+    ```
+
+  * Read the bridge contract address from the L1 deployment records in the `op-node` container:
+
+    ```bash
+    BRIDGE=$(laconic-so deployment --dir optimism-deployment exec op-node "cat /l1-deployment/$DEPLOYMENT_CONTEXT-deploy.json" | jq -r .L1StandardBridgeProxy)
+
+    # Get the funded account's pk
+    ACCOUNT_PK=$(laconic-so deployment --dir optimism-deployment exec op-node "jq -r '.AdminKey' /l2-accounts/accounts.json")
+    ```
+
+  * Check that the starting balance for account on L2 is 0:
+
+    ```bash
+    docker run --rm --network $NETWORK cerc/optimism-contracts:local "cast balance $ACCOUNT --rpc-url $L2_RPC"
+
+    # 0
+    ```
+
+  * Use cast to send ETH to the bridge contract:
+
+    ```bash
+    docker run --rm cerc/optimism-contracts:local "cast send --from $ACCOUNT --value 1ether $BRIDGE --rpc-url $L1_RPC --private-key $ACCOUNT_PK"
+    ```
+
+    * Allow a couple minutes for the bridge to complete
+
+  * Check balance on L2
+
+    ```bash
+    docker run --rm --network $NETWORK cerc/optimism-contracts:local "cast balance $ACCOUNT --rpc-url $L2_RPC"
+
+    # 100000000000000000
+    ```
+
 </details>
 
 <details open>