Additional to-file and from-file sub commands

[timclifford]

As per #80 - this adds two new sub-commands under sync: to-file and from-file. This enables a user to directly import resources from a dump file into a given target environment and it also allows a user to run only a resource dump to file.

$ lagoon-sync sync to-file --help

Use Lagoon-Sync to sync an external environments resources with the local environment

Usage:
  lagoon-sync sync [mariadb|files|mongodb|postgres|etc.] [flags]
  lagoon-sync sync [command]

Available Commands:
  from-file   Sync from a file
  to-file     Sync to a file

Flags:
      --dry-run                          Don't run the commands, just preview what will be run
  -h, --help                             help for sync
      --no-interaction                   Disallow interaction
  -p, --project-name string              The Lagoon project name of the remote system
  -r, --rsync-args string                Pass through arguments to change the behaviour of rsync (default "--omit-dir-times --no-perms --no-group --no-owner --chmod=ugo=rwX --recursive --compress")
  -s, --service-name string              The service name (default is 'cli'
      --skip-source-cleanup              Don't clean up any of the files generated on the source
      --skip-source-run                  Don't run any ops on the source
      --skip-target-cleanup              Don't clean up any of the files generated on the target
      --skip-target-import               This will skip the import step on the target, in combination with 'no-target-cleanup' this essentially produces a resource dump
  -e, --source-environment-name string   The Lagoon environment name of the source system
  -H, --ssh-host string                  Specify your lagoon ssh host, defaults to 'ssh.lagoon.amazeeio.cloud' (default "ssh.lagoon.amazeeio.cloud")
  -i, --ssh-key string                   Specify path to a specific SSH key to use for authentication
  -P, --ssh-port string                  Specify your ssh port, defaults to '32222' (default "32222")
  -t, --target-environment-name string   The target environment name (defaults to local)
  -f, --transfer-resource-name string    The name of the temporary file to be used to transfer generated resources (db dumps, etc) - random /tmp file otherwise
      --verbose                          Run ssh commands in verbose (useful for debugging)

Global Flags:
      --config string   Path to the file used to set lagoon-sync configuration
      --show-debug      Shows debug information

Use "lagoon-sync sync [command] --help" for more information about a command.

The default syncher is mariadb so you can omit it as as argument after sync.

Examples:

This to-file example will perform a database dump of the dev environment.

lagoon-sync sync mariadb to-file -f dev-db-dump.sql.gz -p example-project -e dev --dry-run

This from-file example will import a local database dump into the dev environment of the project.

lagoon-sync sync mariadb from-file -f local-db-dump.sql.gz -p example-project -t dev --dry-run

[tobybellwood]

The ability to sync a single (or regex!) files either way would be useful for some new use cases (specifically syncing a composer.{json|lock} file from prod>local
Bonus points if there was a way to specify them as a built-in option in the config for easy re-use