gatsby.yml

name: 'Gatsby build only on PR'

on:
  pull_request:
    types: [opened, edited, synchronize]

jobs:
  build:
    name: Build Gatsby Site
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Npm Setup
        uses: actions/setup-node@v1
        with:
          node-version: 12.x
      - name: Npm Install
        run: |
          npm i
      - name: Lint
        run: npm run lint
      - name: PR Branch Name
        uses: mdecoleman/pr-branch-name@1.0.0
        id: branchname
        with: 
          repo-token: ${{ secrets.GITHUB_TOKEN }}
      - name: GitHub Environment Variables Action
        uses: FranzDiebold/github-env-vars-action@v1.2.1
      - name: Get PR commit trigger SHA
        uses: bhowell2/github-substring-action@v1.0.0
        id: prsha
        with:
          value: ${{ github.event.pull_request.head.sha }}
          length_from_start: 6
      - name: Get short SHA6
        id: slug
        env:
          PRSHA: ${{ steps.prsha.outputs.substring }}
        run: echo "::set-output name=sha6::$(echo ${PRSHA} | cut -c1-6)"
      - name: Get PR commit trigger SHA
        uses: bhowell2/github-substring-action@v1.0.0
        id: prsha7
        with:
          value: ${{ github.event.pull_request.head.sha }}
          length_from_start: 7
      - name: Get short SHA7
        id: slug7
        env:
          PRSHA: ${{ steps.prsha7.outputs.substring }}
        run: echo "::set-output name=sha7::$(echo ${PRSHA} | cut -c1-7)"
      - name: Modify gatsby prefix in gatsby-config.js
        env:
          SHA: ${{ steps.slug.outputs.sha6 }}
          BRANCH: ${{ steps.branchname.outputs.branch }}
          SLUG: ${{ env.GITHUB_REPOSITORY_NAME }}
        run: |
          sed -i "s@pathPrefix: ''@pathPrefix: '/${SLUG}/review-apps/${BRANCH}/${SHA}'@g" gatsby-config.js
      - name: Build and deploy to gh-pages
        uses: sauloxd/review-apps@v1.3.3
        with:
          build-cmd: 'npx gatsby build --prefix-paths'
          branch: 'gh-pages'
          dist: 'public'
          slug: 'review-apps'
      - name: Comment URL on PR
        uses: unsplash/comment-on-pr@master
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          SHA: ${{ github.event.pull_request.head.sha }}
        with:
          msg: 'https://${{env.GITHUB_REPOSITORY_OWNER_SLUG}}.github.io/${{env.GITHUB_REPOSITORY_NAME}}/review-apps/${{steps.branchname.outputs.branch}}/${{steps.slug.outputs.sha6}}?version=${{steps.slug7.outputs.sha7}}'
          check_for_duplicate_msg: false