Add PR Apps workflow for reviews

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.github/workflows/dactyl.yaml

@@ -0,0 +1,65 @@
+name: "Dactyl build only on PR"
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize]
+
+jobs:
+  build:
+    name: Build Dactyl Site
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Python Setup
+        uses: actions/setup-python@v1
+        with:
+          python-version: "3.7"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install Jinja2==2.11.3
+          pip install dactyl lxml
+      - 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-
+      - name: Build and deploy to gh-pages
+        uses: sauloxd/review-apps@v1.3.3
+        with:
+          build-cmd: "dactyl_build"
+          branch: "gh-pages"
+          dist: "out"
+          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