feat: improve support for multi-module repos

[dolmen]

Description:
Add support for caching dependencies for repositories made of multiple Go modules.

Example:

• Repo dolmen-go/mylogin-driver has Go modules github.com/dolmen-go/mylogin-driver and github.com/dolmen-go/mylogin-driver/cmd/mylogin-query

Justification:
Each Go module has its own set of dependencies. Dependencies caching should cover the union of the dependencies of all Go modules of the repo.

From the documentation, it looks like a single Go module is supported.

Are you willing to submit a PR?
No. I'm not familiar with GitHub Actions development.

[AnatolyRugalev]

Oh wow, I am fighting exactly this right now. I think adding working-directory option will solve this issue for me

[dsame]

Hello @dolmen, thanks for the suggestion, we are starting to investigate it

[dolmen]

Design idea: allow to pass an array of paths for the cache-dependency-path option as an alternative to a string.

Or better: automatically process all go.sum files in the repo.

[dsame]

This feature resembles actions/setup-node#735

[dsame]

Hello @dolmen ,

cache-dependency-path accepts both list and glob syntax:

          cache-dependency-path: |
             hello/go.sum 
             greeting/go.sum

          cache-dependency-path: "**/*.sum"

Sample workflow: https://github.com/akv-demo/test-setup-go/blob/cache-multi/.github/workflows/blank.yml
Sample build: https://github.com/akv-demo/test-setup-go/actions/runs/5799499947/job/15719631207

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