Smaller cache scope for builder cache

GNUmakefile

@@ -54,8 +54,10 @@ yarndep: ## Ensure all yarn dependencies are installed
 	yarn setup:chainlink
 
 .PHONY: gen-builder-cache
-gen-builder-cache: gomod yarndep # generate a cache for the builder image
-
+gen-builder-cache: gomod # generate a cache for the builder image
+	yarn install --frozen-lockfile
+	./tools/bin/restore-solc-cache
+
 .PHONY: install-chainlink
 install-chainlink: chainlink ## Install the chainlink binary.
 	cp $< $(GOBIN)/chainlink

builder-cache.Dockerfile

@@ -1,5 +1,32 @@
 FROM smartcontract/builder:1.0.34
 
 WORKDIR /chainlink
-COPY . . 
+COPY go.mod go.sum yarn.lock package.json .yarnrc GNUmakefile ./
+COPY tools/bin/ldflags tools/bin/ldflags
+COPY tools/bin/restore-solc-cache tools/bin/restore-solc-cache
+COPY .git .git
+COPY VERSION VERSION
+COPY .yarn .yarn 
+COPY patches patches
+COPY solc_bin solc_bin
+COPY belt/package.json belt/package.json
+COPY evm-contracts/package.json evm-contracts/package.json
+COPY evm-test-helpers/package.json evm-test-helpers/package.json
+COPY explorer/client/package.json explorer/client/package.json
+COPY explorer/package.json explorer/package.json
+COPY feeds/package.json feeds/package.json
+COPY integration/package.json integration/package.json
+COPY integration-scripts/package.json integration-scripts/package.json
+COPY operator_ui/package.json operator_ui/package.json
+COPY styleguide/package.json styleguide/package.json
+COPY tools/ci-ts/package.json tools/ci-ts/package.json
+COPY tools/cypress-job-server/package.json tools/cypress-job-server/package.json
+COPY tools/echo-server/package.json tools/echo-server/package.json
+COPY tools/external-adapter/package.json tools/external-adapter/package.json
+COPY tools/json-api-client/package.json tools/json-api-client/package.json
+COPY tools/local-storage/package.json tools/local-storage/package.json
+COPY tools/package.json tools/package.json
+COPY tools/redux/package.json tools/redux/package.json
+COPY tools/ts-helpers/package.json tools/ts-helpers/package.json
+
 RUN make gen-builder-cache