feat: generate ftl-project.toml in the Git root if it DNE

cmd/ftl/cmd_init.go

@@ -16,6 +16,7 @@ import (
 	"github.com/TBD54566975/ftl/backend/schema"
 	"github.com/TBD54566975/ftl/backend/schema/strcase"
 	"github.com/TBD54566975/ftl/buildengine"
+	"github.com/TBD54566975/ftl/common/projectconfig"
 	goruntime "github.com/TBD54566975/ftl/go-runtime"
 	"github.com/TBD54566975/ftl/internal"
 	"github.com/TBD54566975/ftl/internal/exec"
@@ -50,8 +51,10 @@ func (i initGoCmd) Run(ctx context.Context, parent *initCmd) error {
 	if err := updateGitIgnore(i.Dir); err != nil {
 		return err
 	}
+	if err := projectconfig.CreateDefaultFileIfNonexistent(ctx); err != nil {
+		return err
+	}
 	logger.Debugf("Running go mod tidy")
-
 	return exec.Command(ctx, log.Debug, filepath.Join(i.Dir, i.Name), "go", "mod", "tidy").RunBuffered(ctx)
 }
 

common/projectconfig/projectconfig.go

@@ -55,6 +55,22 @@ func GetDefaultConfigPath() string {
 	return filepath.Join(internal.GitRoot(""), "ftl-project.toml")
 }
 
+// CreateDefaultFileIfNonexistent creates the ftl-project.toml file in the Git root if it
+// does not already exist.
+func CreateDefaultFileIfNonexistent(ctx context.Context) error {
+	path := GetDefaultConfigPath()
+	_, err := os.Stat(path)
+	if err == nil {
+		return nil
+	}
+	if !errors.Is(err, os.ErrNotExist) {
+		return err
+	}
+	logger := log.FromContext(ctx)
+	logger.Warnf("Creating a new project config file at %q because the file does not already exist", path)
+	return Save(path, Config{})
+}
+
 func LoadConfig(ctx context.Context, input []string) (Config, error) {
 	logger := log.FromContext(ctx)
 	configPaths := ConfigPaths(input)