Moving to workflow

.github/workflows/docker-image-linux.yml

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+name: Create and publish a Docker image for Linux
+on:
+  release:
+    types: ["published"]
+env:
+  REGISTRY: ghcr.io
+  GITHUBUSER: ${{ github.repository_owner }}
+  IMAGE_NAME: speedtest-cli
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        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:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.GITHUBUSER }}/${{ env.IMAGE_NAME }}:latest
+            ${{ env.REGISTRY }}/${{ env.GITHUBUSER }}${{ env.IMAGE_NAME }}:${{ github.ref_name }}

Dockerfile

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+FROM rockylinux/rockylinux:8.4
+
+RUN curl -s https://packagecloud.io/install/repositories/ookla/speedtest-cli/script.rpm.sh | bash
+
+RUN yum -y install speedtest
+
+RUN echo alias speedtest=\'speedtest --accept-license\' >> ~/.bashrc
+
+CMD ["speedtest"]