Add Dockerfile for libopenshot

[aperture147]

This Dockerfile streamlines the process of bundling libopenshot and its necessary libraries into a single container image, facilitating its deployment as a rendering service.

The standard dependency installation procedure outlined in the libopenshot wiki can result in a significantly larger Docker image due to the inclusion of development dependencies. To mitigate this, the following Dockerfile has been optimized to produce a minimal production-ready image (approximately 800MB unpacked).

The image creation employs a multi-stage build approach:

1. Build Stage: This stage encompasses the installation of build-time dependencies and the compilation of the libopenshot library.
2. Run Stage: This subsequent stage focuses on installing only the essential runtime library dependencies and incorporates the compiled libopenshot artifact from the build stage.

By generating a smaller container image, the cold-start latency when initiating a new libopenshot instance is reduced. This optimization is particularly beneficial for cost-sensitive deployments such as those utilizing RunPod and AWS Fargate, where billing occurs even during the initial spin-up phase.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.89%. Comparing base (e76a3de) to head (6a2b3f7).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #997   +/-   ##
========================================
  Coverage    54.89%   54.89%           
========================================
  Files          185      185           
  Lines        16800    16800           
========================================
  Hits          9222     9222           
  Misses        7578     7578           

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