feat: allow non-default target branch deployments via a new input option

[GrantBirki]

About

This pull request does the following:

• Adds allow_non_default_target_branch_deployments as a new input option. This new input option will allow pull requests that are targeting (merging into) a branch other than the default one (often main) to be deployed. This option is disabled by default as it is potentially unsafe since non-default branches usually lack adequate branch protection rules (or GitHub rulesets).
• Adds non_default_target_branch_used as an output variable. This new output will indicate if a pull request is targeting a branch other than the default branch for the merge. If this is the case, then it will be set to "true".

Usage

- uses: github/[email protected]
  id: branch-deploy
  with:
    trigger: ".deploy"
    allow_non_default_target_branch_deployments: true # <-- allows deployments of pull requests that target a branch other than the default branch

If you also wish to disable the security warnings that come with this setting (due to its risky nature) you can also do so with:

- uses: github/[email protected]
  id: branch-deploy
  with:
    trigger: ".deploy"
    allow_non_default_target_branch_deployments: true
    use_security_warnings: false # <-- disables the security warnings in your logs that come with the 'allow_non_default_target_branch_deployments' option

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related: #341, #340

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