build(deps): bump docker/build-push-action from 2.7.0 to 2.8.0 (#47)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v2.7.0...v2.8.0)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/pr.yml

@@ -19,7 +19,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
 
       - name: Build
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v2.8.0
         with:
           tags: ${{ env.IMAGE_TO_TEST }}
           load: true
@@ -47,7 +47,7 @@ jobs:
 
       - name: Push
         if: contains(github.event.pull_request.labels.*.name, 'ci/push-image')
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v2.8.0
         with:
           tags: ${{ steps.meta.outputs.tags }}
           pull: true