Improve Dockerfile to reduce image size

[tdurieux]

Hi there,

I've made a small improvement to the Dockerfile that I think could help optimize the image size.

Summary of the changes:

• I added npm cache clean after npm install. It helps to reduce the size of the image.
• I added --no-cache flag to apk add to ensure that no useless information is kept inside the Docker image.

Impact on the image size:

• Image size before repair: 603.93 MB
• Image size after repair: 479.92 MB
• Difference: 124.01 MB (20.53%)

I hope that you will find these changes useful to you. Let me know if you have any questions or concerns.

Thanks,

[Amndeep7]

@tdurieux thanks for your contribution! I would love to know more about how you came upon the SAF and how you're using it, especially with your security related projects that I saw from browsing your site. If you're interested in this conversation, please send me an email at amann@mitre.org.