refactor(justfile): split justfile into small files (#42)

- build.just
- debug.just
- dev.just
- gen.just
- pkg.just
- test.just

justfiles/build.just

@@ -0,0 +1,15 @@
+# build binary file
+[group('build')]
+build:
+    @go build -o iris ./cmd/iris
+
+# build with optimized binary file
+[group('build')]
+optimized-build:
+    @GOAMD64=v4 go build -ldflags="-s -w" -trimpath -o iris ./cmd/iris
+
+# build a versioned release binary
+# usage: just build-release v1.2.0
+[group('build')]
+build-release version:
+    @GOAMD64=v3 go build -pgo=auto -ldflags="-s -w -X github.com/versenilvis/iris/root.Version={{version}}" -trimpath -o iris ./cmd/iris