feat: Output Admin Private Key (#71)

This PR exposes `GS_ADMIN_PRIVATE_KEY` to enable owner-restricted
operations, such as management of implementations and bonds in
`DisputeGameFactory`.

src/contracts/contract_deployer.star

@@ -105,6 +105,7 @@ def deploy_l2_contracts(
                 "mv $DEPLOY_CONFIG_PATH /network-configs/getting-started.json",
                 "mv $DEPLOYMENT_OUTFILE /network-configs/kurtosis.json",
                 "mv $STATE_DUMP_PATH /network-configs/state-dump.json",
+                "echo -n $GS_ADMIN_PRIVATE_KEY > /network-configs/GS_ADMIN_PRIVATE_KEY",
                 "echo -n $GS_SEQUENCER_PRIVATE_KEY > /network-configs/GS_SEQUENCER_PRIVATE_KEY",
                 "echo -n $GS_BATCHER_PRIVATE_KEY > /network-configs/GS_BATCHER_PRIVATE_KEY",
                 "echo -n $GS_PROPOSER_PRIVATE_KEY > /network-configs/GS_PROPOSER_PRIVATE_KEY",
@@ -114,6 +115,13 @@ def deploy_l2_contracts(
         wait="300s",
     )
 
+    gs_admin_private_key = plan.run_sh(
+        name="read-gs-admin-private-key",
+        description="Getting the admin private key",
+        run="cat /network-configs/GS_ADMIN_PRIVATE_KEY ",
+        files={"/network-configs": op_genesis.files_artifacts[0]},
+    )
+
     gs_sequencer_private_key = plan.run_sh(
         name="read-gs-sequencer-private-key",
         description="Getting the sequencer private key",
@@ -165,6 +173,7 @@ def deploy_l2_contracts(
     )
 
     private_keys = {
+        "GS_ADMIN_PRIVATE_KEY": gs_admin_private_key.output,
         "GS_SEQUENCER_PRIVATE_KEY": gs_sequencer_private_key.output,
         "GS_BATCHER_PRIVATE_KEY": gs_batcher_private_key.output,
         "GS_PROPOSER_PRIVATE_KEY": gs_proposer_private_key.output,