What does the docker build --no-cache option do?

The option to use the docker build --no-cache command is specifically designed to ignore any cached layers during the image build process. This means that every layer of the image is rebuilt from scratch rather than being pulled from the cache of previously built layers. This approach can be beneficial when you want to ensure that you are using the most current files from your build context or dependencies, as cached layers may refer to older versions of those files. By opting to ignore the cache, you guarantee a fresh build, which can help in scenarios where changes in base images or dependencies need to reflect in the final output.

As a result, this command is useful for ensuring that the built image incorporates the latest changes and is not inadvertently relying on previous builds that might produce outdated or unexpected results.