fixup! Add Makefile, update github actions, fix build cache

Author: jshufro

.github/workflows/build.yml

@@ -17,4 +17,4 @@ jobs:
       - uses: actions/setup-go@v4
         with:
           go-version: 1.21.8
-      - run: make rocketpool-cli rocketpool-daemon
+      - run: make build/rocketpool-cli build/rocketpool-daemon