Bump docker/build-push-action from 2.5.0 to 2.8.0

[dependabot]

Bumps docker/build-push-action from 2.5.0 to 2.8.0.

Release notes

Sourced from docker/build-push-action's releases.

v2.8.0

• Allow specifying subdirectory with default git context (#531)
• Add cgroup-parent, shm-size, ulimit inputs (#501)
• Don't set outputs if empty or nil (#470)
• docs: example to sanitize tags with metadata-action (#476)
• docs: wrong syntax to sanitize repo slug (#475)
• docs: test before pushing your image (#455)
• readme: remove v1 section (#500)
• ci: virtual env file system info (#510)
• dev: update workflow (#499)
• Bump @​actions/core from 1.5.0 to 1.6.0 (#160)
• Bump ansi-regex from 5.0.0 to 5.0.1 (#469)
• Bump tmpl from 1.0.4 to 1.0.5 (#465)
• Bump csv-parse from 4.16.0 to 4.16.3 (#451 #459)

v2.7.0

• Add metadata output (#412)
• Bump @​actions/core from 1.4.0 to 1.5.0 (#439)
• Add note to sanitize tags (#426)
• Cache backend API docs (#406)
• Git context now supports subdir (#407)
• Bump codecov/codecov-action from 1 to 2 (#415)

v2.6.1

• Small typo and ensure trimmed output (#400)

v2.6.0

• Handle git sha version of buildx (#399)
• Update dev deps (#393)
• Use built-in getExecOutput (#392)
• Use core.getBooleanInput (#391)
• Bump csv-parse from 4.15.4 to 4.16.0 (#385)
• Bump @​actions/exec from 1.0.4 to 1.1.0 (#382)
• Bump @​actions/core from 1.3.0 to 1.4.0 (#383)
• Bump ws from 7.3.1 to 7.4.6 (#375)

Commits

• 1814d3d Merge pull request #531 from BeyondEvil/subdir-with-default-context
• fc5a732 Add subdirectory for Git context
• b1aeb11 Merge pull request #510 from crazy-max/venv
• e31f93a ci: virtual env file system info
• 9ed5823 Merge pull request #501 from crazy-max/new-inputs
• 4222161 Merge pull request #500 from crazy-max/readme
• 67ff4df add cgroup-parent, shm-size, ulimit inputs
• 91274a0 sort flags
• ff32939 readme: remove v1 section
• 04841f2 Merge pull request #499 from crazy-max/update-workflow
• Additional commits viewable in compare view

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