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Update the ruby caching example

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The ruby version should be a part of the cache hash. Gems built for one version of ruby may not work with a different version of ruby. Making the ruby version a part of the cache key will bust the cache when the ruby version changes.

 Most ruby projects have a `.ruby-version` file that can be hashed into the cache key.

Use the `--deployment` option with `bundle install` to properly set `vendor/bundle` as the gem path, and also set other options optimized for CI deployment. https://bundler.io/v2.0/man/bundle-install.1.html#DEPLOYMENT-MODE
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Scott Jacobsen 2020-05-01 11:52:15 -06:00 • committed by GitHub
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@ -381,17 +381,15 @@ Replace `~/.local/share/renv` with the correct `path` if not using Ubuntu.
- uses: actions/cache@v1 - uses: actions/cache@v1
with: with:
path: vendor/bundle path: vendor/bundle
key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }} key: ${{ runner.os }}-gems-${{ hashFiles('.ruby-version') }}-${{ hashFiles('**/Gemfile.lock') }}
restore-keys: | restore-keys: |
${{ runner.os }}-gems- ${{ runner.os }}-gems-${{ hashFiles('.ruby-version') }}-
``` ```
When dependencies are installed later in the workflow, we must specify the same path for the bundler. When dependencies are installed later use the `--deployment` flag which tells bundler to install gems to `vendor/bundle`, and sets other options optimized for a CI workflow.
```yaml ```yaml
- name: Bundle install - name: Bundle install
run: | run: bundle install --deployment --jobs 4 --retry 3
bundle config path vendor/bundle
bundle install --jobs 4 --retry 3
``` ```
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