dev: add gopls/delve to flake, add Makefile for proto/test/build

Makefile

@@ -0,0 +1,20 @@
+.PHONY: proto test build vet lint
+
+proto:
+	protoc --go_out=. --go_opt=paths=source_relative proto/agent.proto
+	@# protoc outputs to proto/ due to go_package; move to pb/
+	mv proto/agent.pb.go pb/agent.pb.go
+
+test:
+	go test -race -v ./...
+
+build:
+	go build -o towerops-agent .
+
+vet:
+	go vet ./...
+
+lint:
+	golangci-lint run
+
+all: proto vet test build

flake.nix

@@ -19,11 +19,20 @@
             pkgs.protobuf
             pkgs.protoc-gen-go
             pkgs.git
+            pkgs.gopls
+            pkgs.delve
           ];
 
           env = {
             PROTOC = "${pkgs.protobuf}/bin/protoc";
           };
+
+          shellHook = ''
+            echo "towerops-agent dev shell"
+            echo "  go test ./...    - run tests"
+            echo "  go build ./...   - build"
+            echo "  make proto       - regenerate protobuf"
+          '';
         };
       });
 }