feat: Add WithEnvVars option to pass environment variables (#33)

Added WithEnvVars function to set environment variables in Options struct.

Author: Excoriate

pkg/scenario/client.go

@@ -29,6 +29,8 @@ type Options struct {
 	isParallel bool
 	// retryOptions
 	retryOptions *retryableOptions
+	//envVars is the environment variables
+	envVars map[string]string
 }
 
 type retryableOptions struct {
@@ -106,6 +108,13 @@ func WithParallel() OptFn {
 	}
 }
 
+func WithEnvVars(envVars map[string]string) OptFn {
+	return func(o *Options) error {
+		o.envVars = envVars
+		return nil
+	}
+}
+
 func WithVarFiles(workdir string, varFiles ...string) OptFn {
 	return func(o *Options) error {
 		if err := validation.IsValidTFDir(workdir); err != nil {