Bump the github-actions group with 2 updates

Bumps the github-actions group with 2 updates: [actions/add-to-project](https://github.com/actions/add-to-project) and [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `actions/add-to-project` from 1.0.2 to 2.0.0
- [Release notes](https://github.com/actions/add-to-project/releases)
- [Commits](https://github.com/actions/add-to-project/compare/v1.0.2...v2.0.0)

Updates `docker/build-push-action` from 6 to 7
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/add-to-project
  dependency-version: 2.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: docker/build-push-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

.github/workflows/add-to-project.yml

@@ -12,7 +12,7 @@ jobs:
     name: Add issue to project
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/add-to-project@v1.0.2
+      - uses: actions/add-to-project@v2.0.0
         with:
           project-url: https://github.com/orgs/GothenburgBitFactory/projects/4
           github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}