Update deploy-alpha workflow for tag-based triggers

Removed the branch-based trigger to deploy only on tagged commits and cleaned up an unused environment variable. This ensures deployments to the alpha environment are streamlined and less error-prone.

.github/workflows/deploy-alpha.yml

@@ -2,8 +2,6 @@ name: Test and Publish
 
 on:
  push:
- branches:
- - main
  tags:
  - '*-alpha'
 
@@ -37,7 +35,6 @@ jobs:
  - name: Publish Plugin
  run: ./gradlew build test publishPlugin
  env:
- PLUGIN_REPO: ${{ secrets.PLUGIN_REPO }}
  CERTIFICATE_CHAIN: ${{ secrets.CERTIFICATE_CHAIN }}
  PRIVATE_KEY: ${{ secrets.PRIVATE_KEY }}
  PRIVATE_KEY_PASSWORD: ${{ secrets.PRIVATE_KEY_PASSWORD }}