fix(core): set miner.etherbase in clique mode (#2210)

* fix(core): set miner.etherbase in clique mode

 * ethereum/go-ethereum#26413 caused the default
   clique configuration for the GethInstance to fail to start, because
   we did not pass a `miner.etherbase` flag on startup
 * adds a `miner.etherbase` flag with the clique signer address as the
   argument

* use format str instead of to_string

* add comment on Debug

* update is_clique comment for miner.etherbase

* fix first etherbase flag

* cargo fmt

ethers-core/src/utils/geth.rs

@@ -241,8 +241,11 @@ impl Geth {
         self
     }
 
-    /// Sets the Clique Private Key  to the `geth` executable, which will be later
+    /// Sets the Clique Private Key to the `geth` executable, which will be later
     /// loaded on the node.
+    ///
+    /// The address derived from this private key will be used to set the `miner.etherbase` field
+    /// on the node.
     #[must_use]
     pub fn set_clique_private_key<T: Into<SigningKey>>(mut self, private_key: T) -> Self {
         self.clique_private_key = Some(private_key.into());
@@ -392,24 +395,34 @@ impl Geth {
                 let clique_config = CliqueConfig { period: Some(0), epoch: Some(8) };
                 genesis.config.clique = Some(clique_config);
 
+                let clique_addr = secret_key_to_address(
+                    self.clique_private_key.as_ref().expect("is_clique == true"),
+                );
+
                 // set the extraData field
-                let extra_data_bytes = [
-                    &[0u8; 32][..],
-                    secret_key_to_address(
-                        self.clique_private_key.as_ref().expect("is_clique == true"),
-                    )
-                    .as_ref(),
-                    &[0u8; 65][..],
-                ]
-                .concat();
+                let extra_data_bytes =
+                    [&[0u8; 32][..], clique_addr.as_ref(), &[0u8; 65][..]].concat();
                 let extra_data = Bytes::from(extra_data_bytes);
                 genesis.extra_data = extra_data;
+
+                // we must set the etherbase if using clique
+                // need to use format! / Debug here because the Address Display impl doesn't show
+                // the entire address
+                cmd.arg("--miner.etherbase").arg(format!("{clique_addr:?}"));
             }
         } else if is_clique {
+            let clique_addr =
+                secret_key_to_address(self.clique_private_key.as_ref().expect("is_clique == true"));
+
             self.genesis = Some(Genesis::new(
                 self.chain_id.expect("chain id must be set in clique mode"),
-                secret_key_to_address(self.clique_private_key.as_ref().expect("is_clique == true")),
+                clique_addr,
             ));
+
+            // we must set the etherbase if using clique
+            // need to use format! / Debug here because the Address Display impl doesn't show the
+            // entire address
+            cmd.arg("--miner.etherbase").arg(format!("{clique_addr:?}"));
         }
 
         if let Some(ref genesis) = self.genesis {