Migrated to external deploy-preview action

.github/workflows/deploy-preview.yml

@@ -17,25 +17,13 @@ jobs:
         uses: actions/setup-node@v1
         with:
           node-version: 14.15
-      - name: Generate slug
-        id: generate_slug
-        run: echo "##[set-output name=slug;]$(echo ${GITHUB_HEAD_REF#refs/heads/} | sed -r 's/[~\^]+//g' | sed -r 's/[^a-zA-Z0-9]+/-/g' | sed -r 's/^-+\|-+$//g' | tr A-Z a-z)"
       - name: Build
         run: |
           npm ci && \
           node ./scripts/set-homepage.js /shlink-web-client/${{ steps.generate_slug.outputs.slug }} && \
           rm src/service-worker.ts && \
           npm run build
-      - name: Deploy
-        uses: JamesIves/github-pages-deploy-action@4.1.1
+      - name: Deploy preview
+        uses: shlinkio/deploy-preview-action@v1
         with:
-          branch: preview-env
           folder: build
-          target-folder: ${{ steps.generate_slug.outputs.slug }}
-      - name: Publish env
-        uses: marocchino/sticky-pull-request-comment@v2
-        with:
-          header: Preview environment
-          message: |
-            ## Preview environment
-            https://shlinkio.github.io/shlink-web-client/${{ steps.generate_slug.outputs.slug }}/