Create A Dockerfile supporting multiple arch

The key point is ARG TARGETARCH You have to declare it before using it as variable

FROM python:3

ARG TARGETARCH
WORKDIR /app

RUN git clone https://github.com/MurmursDev/easyblogger.git
RUN cd easyblogger && pip install .
RUN rm -rf easyblogger
RUN wget https://github.com/jgm/pandoc/releases/download/3.1.1/pandoc-3.1.1-1-$TARGETARCH.deb
RUN dpkg -i pandoc-3.1.1-1-$TARGETARCH.deb
RUN rm pandoc-3.1.1-1-$TARGETARCH.deb

ENTRYPOINT ["/usr/local/bin/easyblogger"]

Create a Github Workflow

name: ci

on:
  push:
    branches:
      - "main"

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v3
      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v2
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
      -
        name: Login to Docker Hub
        uses: docker/login-action@v2
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      -
        name: Build and push
        uses: docker/build-push-action@v4
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          tags: murmursdev/easyblogger:latest

Reference

https://github.com/MurmursDev/easyblogger-docker