OZ-331: Add backup and restore support

[enyachoke]

This PR introduces backup and restore support for Ozone powered by Restic and a custom wrapper project to allow us to use Docker Labels to enable backup and restore.

The project has two services ;

• Backup Service (Enabled by default)
• The restore service, which can be run on time to restore from a backup generated by the backup service

Backup and Restore when using the Ozone helper scripts

These instructions assume you are already in the Ozone Scripts directory --> see the start Documentation

Backup to Local Path

export BACKUP_PATH=/tmp/backup

./start.sh

Backup to S3

To setup the S3 bucket and user following the instructions in the Restic docs
Export the required ENVs

export AWS_ACCESS_KEY_ID='secret' 
export AWS_SECRET_ACCESS_KEY='secret' 
export RESTIC_REPOSITORY='s3:s3.amazonaws.com/ozone-dev-backup'
export AWS_DEFAULT_REGION='eu-west-1'

Run the start script
./start.sh

Restoring

Restoring from Local path

Export the required ENVs

export BACKUP_PATH=/tmp/backup
export COMPOSE_PROFILES='openmrs-restore,odoo-restore'
export RESTORE="true"

Run the start script
./start.sh

Restoring from S3

Export the required ENVs

export AWS_ACCESS_KEY_ID='secret' 
export AWS_SECRET_ACCESS_KEY='secret' 
export RESTIC_REPOSITORY='s3:s3.amazonaws.com/ozone-dev-backup'
export AWS_DEFAULT_REGION='eu-west-1'
export COMPOSE_PROFILES='openmrs-restore,odoo-restore'
export RESTORE="true"

Run the start script
./start.sh

Restic provides a rich set of features and a backup storage backend, but this PR supports only a small subset of the features and local path and S3 for the backup storage backend.

** Supported Configuration **

Env Variable	Details	Example
RESTIC_REPOSITORY	Location of repository. A repository in Restic is refers to where the backups will be stored	/restic-backups , s3:s3.amazonaws.com/ozone-dev-backup
RESTIC_PASSWORD	The password used to unlock the repository
CRON_SCHEDULE	Unix Cron pattern for when the backup with happen	*/5 * * * *
AWS_DEFAULT_REGION	This is used to set the bucket region when RESTIC_REPOSITORY is S3
AWS_ACCESS_KEY_ID	This is used to set the AWS access key id when RESTIC_REPOSITORY is S3
AWS_SECRET_ACCESS_KEY	This is used to set the AWS secret when RESTIC_REPOSITORY is S3
RESTORE	This variable is only needed when you want to test the restore using the start.sh helper script. It has to be set to true	export RESTORE="true"
COMPOSE_PROFILES	Along side env above, you have to enable the restore Docker compose profiles for the services you wish to restore when running with the start.sh	export COMPOSE_PROFILES=openmrs-restore,odoo-restore
RESTIC_KEEP_WEEKLY	How many weeks back we should keep at least one snapshot
RESTIC_KEEP_MONTHLY	How many months back we should keep at least one snapshot
RESTIC_KEEP_YEARLY	How many years back we should keep at least one snapshot
LOG_LEVEL	The log level for the Docker Compose Wrapper	info
RESTIC_LOCAL_BACKUP_PATH	The external directory for storing restic backups when storing the backups on the local disk

Ticket --> https://mekomsolutions.atlassian.net/browse/OZ-331

[rbuisson]

Remove that last extra line.

[enyachoke]

@rbuisson done