What causes "unmarshal image env: %w" in nektos/act?

Ensure the image's Env entries are valid KEY=VALUE strings; a malformed image config can cause this.

unmarshal image env: %w

Error message

unmarshal image env: %w

What it means

Error "unmarshal image env: %w" thrown in nektos/act.

Source

Thrown at pkg/container/docker_run.go:530

imageEnv, err := godotenv.Unmarshal(strings.Join(inspectResult.Config.Env, "\n"))
if err != nil {
	logger.Error(err)
	return fmt.Errorf("unmarshal image env: %w", err)
}

View on GitHub (pinned to 4f41128141)

Solutions

Ensure the image's Env entries are valid KEY=VALUE strings; a malformed image config can cause this.
Rebuild or repull the image to fix corrupted image metadata.

When it happens

Trigger: Thrown at pkg/container/docker_run.go:530 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nektos/act@4f41128141 (2026-08-15). Data as JSON: /api/errors/eb6d790fbc7675e7. Report an issue: GitHub.