Add selective preloading of Bash script modules #1730
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This PR introduces an opt-in way to preload Bash script modules before the user’s Bash script runs.
New variable: Octopus.Action.Script.PreloadScriptModules
If that variable is set, Calamari will source specific script modules in the bootstrapper first.
Then it sources the actual user script as usual.
Usage
Set the project variable and scope it to a process. Can scope to specific steps for different requirements, and maintain an entry not scoped at step-level if you want to define a default across the process.
Test scenario
Modules defined:

Project variables:

Deployment process with 2 steps (both running same inline script):

Logs (verbose) Step 1:

Logs (verbose) Step 2:
