Enhance Install Script with Version Check and Force Install Option

[james-crowley]

This PR introduces improvements to the Act install script by adding logic to check if Act is already installed. If the installed version matches the requested tag, the script will skip the installation process. This enhancement is particularly useful in CI environments where Act might already be preinstalled, reducing redundant downloads and saving bandwidth.

Key Changes:

• Version Check Logic: The script now checks if Act is already installed and whether its version matches the requested tag. If a match is found, the installation is skipped.

• Force Install Flag -f: A new CLI flag -f has been added to bypass the version check. This ensures flexibility when users explicitly want to reinstall or downgrade Act.

• Upgrade & Downgrade: The script only skips installation if the installed version matches the requested tag. It doesn’t prevent downgrades or upgrades to different versions, offering control to the end user.

[mergify]

@james-crowley this pull request has failed checks 🛠

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.75%. Comparing base (5a80a04) to head (d55c6e4).
Report is 138 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2575      +/-   ##
==========================================
+ Coverage   61.56%   68.75%   +7.19%     
==========================================
  Files          53       71      +18     
  Lines        9002    10918    +1916     
==========================================
+ Hits         5542     7507    +1965     
+ Misses       3020     2848     -172     
- Partials      440      563     +123     

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