docs: add simple Go guide

Signed-off-by: Tanguy ⧓ Herrmann <tanguy@dagger.io>

docs/guides/1228-go-ci.md

@@ -0,0 +1,33 @@
+---
+slug: /1227/go-ci
+displayed_sidebar: europa
+---
+
+# Go project CI
+
+We want to run some tests and build a Go project with the `go` cue package.
+
+## Plan
+
+The plan consist of 2 actions:
+
+- `test` for `go test`
+- `build` for `go build`
+
+both use the [Go dagger package](https://github.com/dagger/dagger/tree/main/pkg/universe.dagger.io/go)
+
+```cue file=../plans/go-ci/plan.cue
+```
+
+## Go project
+
+The project is a simple program that takes `$NAME` environment variable, use the [Go greeting package](https://github.com/dagger/dagger/tree/main/docs/plans/go-ci/hello/greeting) to print the `greeting.Greet()` out.
+
+```go file=../plans/go-ci/hello/main.go
+```
+
+```go file=../plans/go-ci/hello/greeting/greeting.go
+```
+
+```go file=../plans/go-ci/hello/greeting/greeting_test.go
+```