Add Docker image and auto publishing

.github/workflows/publish.yml

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+name: Publish Docker image
+on: push
+
+jobs:
+  publish:
+    name: Publish
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: latest
+          labels: "ghcr.io/${{ github.repository }}"

Dockerfile

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+FROM linuxserver/snapdrop:version-eac78009
+COPY index.html /app/www/client/index.html
+COPY style.css /app/www/client/styles.css