Install Sitemap plugin on Jekyll static sites

[btylerburton]

User Story

In order to accurately audit the content on a static site, datagovteam wants to install the Jekyll sitemap plugin to generate a sitemap.

This will be done on:

• https://github.com/GSA/data-strategy
• https://github.com/GSA/sdg-indicators-usa
• https://github.com/GSA/us-data-federation

The sitemap plugin should be added to the Gemfile and the _config.yml.

References for how to implement this are provided from the resources.data.gov repo:

• https://github.com/GSA/resources.data.gov/blob/main/Gemfile#L19
• https://github.com/GSA/resources.data.gov/blob/main/_config.yml#L28

Acceptance Criteria

[ACs should be clearly demoable/verifiable whenever possible. Try specifying them using BDD.]

• GIVEN I have added the jekyll-sitemap plugin to the above files
  AND I have generated a new build
  WHEN I visit {site_url}/sitemap.xml
  THEN I expect to see a working sitemap

Background

[Any helpful contextual notes or links to artifacts/evidence, if needed]

This is done to assist in quarterly content audit tasks.

Security Considerations (required)

[Any security concerns that might be implicated in the change. "None" is OK, just be explicit here!]

Sketch

• Add jekyll-sitemap plugin to:
  • Gemfile
  • _config.yml
• Generate a new pages.cloud.gov build
• Confirm the sitemap is generated by visiting {site_url}/sitemap.xml

[btylerburton]

We don't need to worry about installing in sdg-indicators-usa as the content isn't ours and we can't update the site anyway.