feat: add Timeweb Cloud provider for Woodpecker CI autoscaler

- Implement timewebcloud provider with DeployAgent, RemoveAgent, ListDeployedAgentNames
- Add minimal HTTP API client for Timeweb Cloud (create/list/delete servers)
- Register provider in main.go with CLI flags
- Add timeweb-list and timeweb-tester utilities
- Include Dockerfile and docker-compose.yml for deployment
- Update DEPLOY.md with verified OS/preset IDs

engine/inits/cloudinit/cloudinit_test.go

@@ -0,0 +1,65 @@
+package cloudinit_test
+
+import (
+	"testing"
+	"text/template"
+
+	"github.com/stretchr/testify/assert"
+
+	"go.woodpecker-ci.org/autoscaler/config"
+	"go.woodpecker-ci.org/autoscaler/engine/inits/cloudinit"
+	"go.woodpecker-ci.org/woodpecker/v3/woodpecker-go/woodpecker"
+)
+
+var testUserDataStr = `
+image: {{ .Image }}
+environment:
+	{{- range $key, $value := .Environment }}
+	- {{ $key }}={{ $value }}
+	{{- end }}
+`
+
+var testUserDataTmpl = template.Must(template.New("test").Parse(testUserDataStr))
+
+func TestRenderUserDataTemplate(t *testing.T) {
+	config := &config.Config{
+		Image:       "test-image",
+		GRPCAddress: "test-address",
+		GRPCSecure:  false,
+		Environment: map[string]string{
+			"FOO": "bar",
+		},
+	}
+	agent := &woodpecker.Agent{
+		Token: "test-token",
+	}
+
+	userData, err := cloudinit.RenderUserDataTemplate(config, agent, testUserDataTmpl)
+
+	assert.NoError(t, err)
+	assert.Contains(t, userData, "test-image")
+	assert.Contains(t, userData, "bar")
+	assert.Contains(t, userData, "WOODPECKER_SERVER=test-address")
+	assert.Contains(t, userData, "WOODPECKER_AGENT_SECRET=test-token")
+}
+
+func TestRenderUserDataTemplate_Secure(t *testing.T) {
+	config := &config.Config{
+		GRPCSecure: true,
+	}
+	agent := &woodpecker.Agent{}
+
+	userData, err := cloudinit.RenderUserDataTemplate(config, agent, testUserDataTmpl)
+
+	assert.NoError(t, err)
+	assert.Contains(t, userData, "WOODPECKER_GRPC_SECURE=true")
+}
+
+func TestRenderUserDataTemplate_Error(t *testing.T) {
+	config := &config.Config{}
+	agent := &woodpecker.Agent{}
+	tmpl := template.Must(template.New("test").Parse("{{.Missing}}"))
+
+	_, err := cloudinit.RenderUserDataTemplate(config, agent, tmpl)
+	assert.Error(t, err)
+}