A github action workflow, which gets triggered if a PR is opened against master, does deployment from the PR to a DO kubernetes cluster

deploy-from-pr.yaml

name: deploy-from-pr

on:
  pull_request:
    branches:
      - master

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  deploy-from-pr:
    name: Deploy from PR to Development
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - name: Set version
        id: release
        run: echo ::set-output name=version::$(git describe --always)

      # custom action to build and push image
      - name: Build & publish image
        uses: ./.github/actions/publish-image
        with:
          registry: ${{ env.REGISTRY }}
          registry_username: ${{ github.REGISTRY_USERNAME }}
          registry_password: ${{ secrets.REGISTRY_PASSWORD }}
          image_name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tag: ${{ steps.release.outputs.version }}

      # custom action to deploy into kubernetes
      - name: Deploy to kubernetes
        uses: ./.github/actions/deploy-to-k8s
        with:
          digitalocean_token: ${{ secrets.DIGITALOCEAN_TOKEN }}
          cluster_name: ${{ secrets.CLUSTER_NAME }}
          overlay_path: .k8s/overlays/dev
          image_name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tag: ${{ steps.release.outputs.version }}