Incorrect PURL type for Alpine packages

[keshav-space]

Description

Currently, we use alpine as the PURL type for Alpine packages, which is not in line with the latest Package-URL Spec.
Alpine packages should use apk as the PURL type.

These package handler should use apk as default package type:

• scancode-toolkit/src/packagedcode/alpine.py

  Line 40 in 6570c13

  default_package_type = 'alpine'

• scancode-toolkit/src/packagedcode/alpine.py

  Line 64 in 6570c13

  default_package_type = 'alpine'

• scancode-toolkit/src/packagedcode/alpine.py

  Line 135 in 6570c13

  default_package_type = 'alpine'

Related issues in other projects:

• Incorrect scheme for AlpineLinuxVersionRange univers#191
• Incorrect scheme in Alpine Linux VERS range vulnerablecode#2286

[kx7m2qd]

Hi @keshav-space, I'd like to fix this. The change is straightforward updating default_package_type from 'alpine' to 'apk' in the three locations in alpine.py. I also noticed the related issues in univers (#191) and vulnerablecode (#2286) should I fix all three repos in coordinated PRs or just start with scancode-toolkit? Is this available to work on?