feat: CD workflow cache & add CI workflow

[kylemocode]

Why need this change? / Root cause:

• The original workflow would only be triggered when a feature is merged into the main branch. However, this means that when a feature branch initiates a pull request, it can't utilize CI to improve reliability. Therefore, I've added a new workflow (ci.yaml) that executes when a pull request is created, modified, or closed, and it will run tests and build during this process.
• I've added a caching mechanism to the original deploy workflow, which caches node_modules and the Cypress binary. If cache got hit, the installation of dependencies step will not run. This can reduce the workflow execution time when dependencies remain unchanged.
• For information about the caching mechanism of GitHub Actions, you can refer to this article. Since it maintains a cache for each branch, I have chosen to add the caching mechanism only to the merge workflow of the main branch, and not to the pipeline of the pull request for the time being, as the chances of cache-hit will be lower.
• I found that the original way of using an if statement to determine whether to execute still initially triggers the workflow, then exits if conditions are not met.(like the image below) I've revised this to write the condition in the on statement instead, so the workflow will not trigger if the conditions aren't met.

(some workflow just triggered and canceled in few seconds)

Changes made:

Test Scope / Change impact:

Without Cache (⏰ Time spent: 2:00)	With Cache (⏰ Time spent: 1:15)

Issue