ci(caching): add cache for conda environment in template ci

[Naman-Priyadarshi]

Pull Request description

Implemented caching for conda environment in template's ci Fixes #102

How to test these changes

• ...

Pull Request checklists

This PR is a:

• [ ] bug-fix
• [x] new feature
• [ ] maintenance

About this PR:

• [ ] it includes tests.
• [ ] the tests are executed on CI.
• [ ] the tests generate log file(s) (path).
• [x] pre-commit hooks were executed locally.
• [ ] this PR requires a project documentation update.

Author's checklist:

• [x] I have reviewed the changes and it contains no misspelling.
• [x] The code is well commented, especially in the parts that contain more complexity.
• [x] New and old tests passed locally.

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Reviewer's checklist

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## Reviewer's Checklist

- [ ] I managed to reproduce the problem locally from the `main` branch
- [ ] I managed to test the new changes locally
- [ ] I confirm that the issues mentioned were fixed/resolved

[Naman-Priyadarshi]

Hi @xmnlab, How should I define the matrix.os here? The solution we use in scicookie's ci is

tests:
    strategy:
      matrix:
        os:
          - "ubuntu"
          - "macos"
          - "windows"

    runs-on: ${{ matrix.os }}-latest

    concurrency:
      group: ci-main-tests-${{ matrix.os }}-${{ github.ref }}
      cancel-in-progress: true

So should we use a similar structure?

[xmnlab]

@Naman-Priyadarshi , ping me when this is ready again for review, thanks!