indexer: Restore some bindings

To support Bedrock and non-Bedrock within the same indexer, we need to include the SCC bindings.

indexer/Makefile

@@ -7,6 +7,10 @@ LDFLAGSSTRING +=-X main.GitDate=$(GITDATE)
 LDFLAGSSTRING +=-X main.GitVersion=$(GITVERSION)
 LDFLAGS := -ldflags "$(LDFLAGSSTRING)"
 
+# Note: Requires legacy contracts to be built before
+# running and binding-related Make targets.
+SCC_ABI_ARTIFACT = ../packages/contracts/artifacts/contracts/L1/rollup/StateCommitmentChain.sol/StateCommitmentChain.json
+
 indexer:
 	env GO111MODULE=on go build -v $(LDFLAGS) ./cmd/indexer
 
@@ -19,8 +23,28 @@ test:
 lint:
 	golangci-lint run ./...
 
+bindings: bindings-scc
+
+bindings-scc:
+	$(eval temp := $(shell mktemp))
+
+	cat $(SCC_ABI_ARTIFACT) \
+		| jq -r .bytecode > $(temp)
+
+	cat $(SCC_ABI_ARTIFACT) \
+		| jq .abi \
+		| abigen --pkg scc \
+		--abi - \
+		--out bindings/scc/statecommitmentchain.go \
+		--type StateCommitmentChain \
+		--bin $(temp)
+
+	rm $(temp)
+
 .PHONY: \
 	indexer \
+	bindings \
+	bindings-scc \
 	clean \
 	test \
 	lint