Bump docker/metadata-action from 3.7.0 to 3.8.0

Created by: dependabot[bot]

Bumps docker/metadata-action from 3.7.0 to 3.8.0.

Release notes

Sourced from docker/metadata-action's releases.

v3.8.0

• Add attribute to enable/disable images by @​crazy-max (#193)
• Add is_default_branch global expression by @​crazy-max (#192 #197 #198)
• Update fixtures (dev) by @​crazy-max (#190)
• Bump semver from 7.3.5 to 7.3.7 (#185)
• Bump moment from 2.29.2 to 2.29.3 (#187)
• Bump csv-parse from 4.16.3 to 5.0.4 (#195)

Full Changelog: https://github.com/docker/metadata-action/compare/v3.7.0...v3.8.0

Commits

• b2391d3 Merge pull request #193 from crazy-max/images-opts
• 2f4dd14 backward compatibility with old images format
• a5680a6 attribute to enable/disable images
• be6d2cc Merge pull request #198 from crazy-max/refactor-default-banch
• 0a72be4 don't handle default branch global exp for pr events
• 72fe50e Merge pull request #197 from crazy-max/rm-baseref-def-branch
• aca951f remove support of default branch global exp for push tag events
• 0978a06 Merge pull request #192 from crazy-max/default-branch
• c2905fb ci: add global expressions job
• 7d7a22a fix undefined base_ref for some events
• Additional commits viewable in compare view

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