when using '--with-proxysql', first check that proxysql is present before deploying instances

[lefred]

Environment

• dbdeployer version: 2.2.3
• Topology: galera --with-proxysql

Describe the bug
When deploying with --with-proxysql, dbdeployer deploys and starts the instances before checking whether proxysql is present, and then fails if it isn't.

Steps to reproduce

$ go run . deploy replication 13.0 --topology=galera --with-proxysql
# 13.0 => 13.0.0
Installing and starting node 1
.. sandbox server started
Installing and starting node 2
...... sandbox server started
Installing and starting node 3
..... sandbox server started
# Pre-exit cleanup. 
#1 - Executing RmdirAll( /var/run/media/fred/DATA/DBDEPLOYER/sandboxes/galera_msb_13_0_0)
ProxySQL deployment failed: proxysql binary not found: proxysql binary not found in PATH: exec: "proxysql": executable file not found in $PATH
exit status 1

Expected behavior
Check that proxysql is present before deploying

Actual behavior
It checks AFTER

[coderabbitai]

🔗 Related PRs

#81 - fix: resolve all CI failures [merged]

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[lefred]

And the instances are deployed but not seen by dbdeployer:

$ go run . sandboxes
 msb_13_0_0               :   single   13.0.0   [13000 ]   <-- my previous single instance
$ ps axf | grep [g]alera_msb | grep pid | wc -l
3

[renecannao]

Thank you for the report @lefred .
I think we actually need to first make proxysql available as tarball , or a way to extract the binary from a distro package.
And also pin a specific version.