Add docker publish action

Author: zfir

.github/workflows/docker-publish.yml

@@ -0,0 +1,26 @@
+on:
+  push
+
+jobs:
+  docker:
+    name: Create Heroku Docker Image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: sharinpix/docker-pdfjs:${{ (github.ref == 'refs/heads/main') && 'latest' || format('pr-gh-{0}', github.run_number) }}