test: add e2e tests with local Forgejo instance (#201)

* feat(forge): add new forge for forgejo

We only support repositories hosted on Forgejo instances, but not
Forgejo Actions or Woodpecker as CI solutions for now.

* test(e2e): introduce e2e test framework with local forgejo

test/e2e/forgejo/forge.go

@@ -0,0 +1,113 @@
+package forgejo
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"os/exec"
+	"strings"
+	"testing"
+
+	"codeberg.org/mvdkleijn/forgejo-sdk/forgejo/v2"
+
+	"github.com/apricote/releaser-pleaser/test/e2e"
+)
+
+const (
+	TestAPIURL = "http://localhost:3000"
+
+	TestUserNameTemplate  = "rp-%s"
+	TestUserPassword      = "releaser-pleaser"
+	TestUserEmailTemplate = "releaser-pleaser-%s@example.com"
+	TestTokenName         = "rp"
+	TestTokenScopes       = "write:user,write:issue,write:repository"
+)
+
+type TestForge struct {
+	username string
+	token    string
+	client   *forgejo.Client
+}
+
+func (f *TestForge) Init(ctx context.Context, runID string) error {
+	if err := f.initUser(ctx, runID); err != nil {
+		return err
+	}
+	if err := f.initClient(ctx); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (f *TestForge) initUser(ctx context.Context, runID string) error {
+	f.username = fmt.Sprintf(TestUserNameTemplate, runID)
+
+	//gosec:disable G204
+	if output, err := exec.CommandContext(ctx,
+		"docker", "compose", "exec", "--user=1000", "forgejo",
+		"forgejo", "admin", "user", "create",
+		"--username", f.username,
+		"--password", TestUserPassword,
+		"--email", fmt.Sprintf(TestUserEmailTemplate, runID),
+		"--must-change-password=false",
+	).CombinedOutput(); err != nil {
+		slog.Debug("create forgejo user output", "output", output)
+		return fmt.Errorf("failed to create forgejo user: %w", err)
+	}
+
+	//gosec:disable G204
+	token, err := exec.CommandContext(ctx,
+		"docker", "compose", "exec", "--user=1000", "forgejo",
+		"forgejo", "admin", "user", "generate-access-token",
+		"--username", f.username,
+		"--token-name", TestTokenName,
+		"--scopes", TestTokenScopes,
+		"--raw",
+	).Output()
+	if err != nil {
+		return fmt.Errorf("failed to create forgejo token: %w", err)
+	}
+
+	f.token = strings.TrimSpace(string(token))
+
+	return nil
+}
+
+func (f *TestForge) initClient(ctx context.Context) (err error) {
+	f.client, err = forgejo.NewClient(TestAPIURL,
+		forgejo.SetToken(f.token),
+		forgejo.SetUserAgent("releaser-pleaser-e2e-tests"),
+		forgejo.SetContext(ctx),
+		// forgejo.SetDebugMode(),
+	)
+	return err
+}
+
+func (f *TestForge) CreateRepo(t *testing.T, opts e2e.CreateRepoOpts) (*e2e.Repository, error) {
+	t.Helper()
+
+	repo, _, err := f.client.CreateRepo(forgejo.CreateRepoOption{
+		Name:          opts.Name,
+		Description:   opts.Description,
+		DefaultBranch: opts.DefaultBranch,
+		Readme:        "Default",
+		AutoInit:      true,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &e2e.Repository{
+		Name: repo.Name,
+	}, nil
+}
+
+func (f *TestForge) RunArguments() []string {
+	return []string{"--forge=forgejo",
+		fmt.Sprintf("--owner=%s", f.username),
+		fmt.Sprintf("--api-url=%s", TestAPIURL),
+		fmt.Sprintf("--api-token=%s", f.token),
+		fmt.Sprintf("--username=%s", f.username),
+	}
+}