我一直在努力使用Github操作自动构建我的Dockerfile（位于子目录中）。
我的目录结构如下：

app
├── .github
│   ├── workflows
│   │   └── build.yml
├── encoding
│   ├── encoder.py
│   └── Dockerfile
├── database
│   └── Dockerfile
├── db
    └── <data>
  [...]
├── poetry.lock
├── pyproject.toml
├── LICENSE
└── README.md

我的build.yml如下所示（出于限制目的，仅包括encoding步骤的构建）：

name: Build
on:
  push:
    branches: [ main ]
defaults:
  run:
    shell: bash
jobs:
  encoding_build:
    runs-on: self-hosted
    steps:
    - name: Checkout code
      uses: actions/checkout@v2
    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v2
    - name: Login to private Docker registry 
      uses: docker/login-action@v2
      with:
        username: ${{ secrets.DOCKERHUB_USERNAME }}
        password: ${{ secrets.DOCKERHUB_PASSWORD }}
    - name: Set up Python
      uses: actions/setup-python@v2
      with:
        python-version: '3.8'
    - name: Build Docker image 
      uses: docker/build-push-action@v2
      with:
        context: ../../../encoding
        dockerfile: ./encoding/Dockerfile
        push: true
        tags: <username>/<project_name>:<tag>
        username: ${{ secrets.DOCKERHUB_USERNAME }}
        password: ${{ secrets.DOCKERHUB_PASSWORD }}

我的Dockerfile如下所示：

FROM python:3.8

WORKDIR /app/

ADD ./pyproject.toml /tmp/ 
ADD ./poetry.lock /tmp/
RUN cp /tmp/pyproject.toml /tmp/poetry.lock /app/

RUN pip install poetry
RUN poetry config virtualenvs.create false && poetry install --no-root --no-dev -vvv

COPY encoder.py /app/

WORKDIR /app/

CMD ["python", "encoder.py", "--input_file", "/app/input.txt", "--output_file", "/app/output.txt", "--model_name_or_path", "bert-base-uncased"]

我已经检查了this SO question，并根据vivekyad 4v和Sal Borrelli的答案创建了上下文和dockerfile参数;但是自动构建似乎不起作用。当我将任何更改推送到我的存储库时，我得到了以下错误：

Error: buildx failed with: ERROR: unable to prepare context: path "../../../encoding" not found

如果有人能帮助我解决我的错误，我将非常感激。此外，任何额外的Docker或Github行动相关的评论是受欢迎的！