Provisioning: Add Validation and Mutation for Connection resource (#115596)

* WIP: mutator added, start working on validator

* first validator iteration

* second validator iteration

* wip: working on integration tests

* re-working mutation and validation, using Connection interface

* fixing some rebase things

* fixing integration tests

* formatting

* fixing unit tests

* k8s codegen

* linting

* moving tests which are available only for enterprise

* addressing comments: using repo config for connections, updating tests

* addressing comments: adding some more info in the app and installation

* fixing app data

* addressing comments: updating connection implementation

* addressing comments

* formatting

* fixing tests

apps/provisioning/pkg/connection/github/factory.go

@@ -0,0 +1,39 @@
+package github
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/google/go-github/v70/github"
+	"golang.org/x/oauth2"
+
+	common "github.com/grafana/grafana/pkg/apimachinery/apis/common/v0alpha1"
+)
+
+// Factory creates new GitHub clients.
+// It exists only for the ability to test the code easily.
+type Factory struct {
+	// Client allows overriding the client to use in the GH client returned. It exists primarily for testing.
+	// FIXME: we should replace in this way. We should add some options pattern for the factory.
+	Client *http.Client
+}
+
+func ProvideFactory() GithubFactory {
+	return &Factory{}
+}
+
+func (r *Factory) New(ctx context.Context, ghToken common.RawSecureValue) Client {
+	if r.Client != nil {
+		return NewClient(github.NewClient(r.Client))
+	}
+
+	if !ghToken.IsZero() {
+		tokenSrc := oauth2.StaticTokenSource(
+			&oauth2.Token{AccessToken: string(ghToken)},
+		)
+		tokenClient := oauth2.NewClient(ctx, tokenSrc)
+		return NewClient(github.NewClient(tokenClient))
+	}
+
+	return NewClient(github.NewClient(&http.Client{}))
+}