[#27] Generate the "sample" project from the template

[luongvo]

• Close #27

What happened 👀

• Create a simple make.sh to generate the project from the template, which basically copies all project files to the sample folder, except .git and sample.
• Create a test workflow with a job "generate_sample_project" to generate the project.

Insight 📝

• We need to check out the source code with the corresponding working branch name for pushing up. Otherwise, it will throw the error fatal: You are not currently on a branch. 💥 https://github.com/nimblehq/kmm-templates/actions/runs/5862694160/job/15894905375.
  • To check out to the corresponding working branch name, use ref: ${{ github.head_ref }} https://laurentsenta.com/digital-garden/programming/github-actions-tips/ ✅
• The job generate_sample_project to generate the project will be executed after the job test is completed successfully.

Proof Of Work 📹

• There is a new commit to push the sample project changes on each PR for verifying https://github.com/nimblehq/kmm-templates/pull/28/commits

👉 A new sample project folder for reference https://github.com/nimblehq/kmm-templates/tree/feature/27-generate-sample-project/sample

[luongvo]

@suho @lydiasama @AVI5HEK @markgravity @kaungkhantsoe We need 1 more approval on this PR to process the next steps 👋