feat: add custom cache prefix

[bahmutov]

Add cache prefix

If you are installing different individual tools, you might want to have different caches. You can insert custom cache prefix strings into the cache keys. For example, let's install two different tools, each cache will be separate.

- name: Install tool A
  uses: bahmutov/npm-install@v1
  with:
    # use just package.json checksum
    useLockFile: false
    install-command: 'npm install tool-a'
    cache-key-prefix: tool-a

- name: Install tool B
  uses: bahmutov/npm-install@v1
  with:
    # use just package.json checksum
    useLockFile: false
    install-command: 'npm install tool-b'
    cache-key-prefix: tool-b

The first cache will have key npm-tool-a-... and the second cache will have key npm-tool-b-...

• closes #217

[github-actions[bot]]

:tada: This PR is included in version 1.10.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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