Merge branch 'add-tasks' into 'master'

README.md

examples/clear-cache-taskrun.yaml

examples/database-backup-taskrun.yaml

examples/database-restore-taskrun.yaml

examples/publish-unpublish-taskrun.yaml

roles/role.yaml

tasks/clear-cache.yaml

tasks/database-backup.yaml

tasks/database-restore.yaml

tasks/publish-unpublish.yaml