move promtail data to persistent storage

[darrylmendillo]

When Promtail restarts, the file positions are reset to 0 causing promtail to reship all logs resulting in duplicate data.

• [x] Develop procedure to backup and restore locations in current state
• [x] Update promtail job to mount config and data to persistent storage

[darrylmendillo]

position files mounted on deploy/promtail-data/. This should stop them from resetting position to 0