Use prebuilt Docker image for Gitea workflows

runner-image/Dockerfile

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+FROM node:20-bookworm
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+      ca-certificates \
+      git \
+      python3 \
+      python3-pip \
+      python3-venv \
+      tzdata && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY requirements.lock /tmp/requirements.lock
+
+RUN python3 -m venv /opt/blackout-venv && \
+    /opt/blackout-venv/bin/pip install --no-cache-dir -r /tmp/requirements.lock && \
+    /opt/blackout-venv/bin/python -c "import dotenv, jdatetime, requests" && \
+    /opt/blackout-venv/bin/pytest --version && \
+    /opt/blackout-venv/bin/ruff --version && \
+    rm /tmp/requirements.lock
+
+ENV PATH="/opt/blackout-venv/bin:$PATH" \
+    PYTHONDONTWRITEBYTECODE="1" \
+    PYTHONUNBUFFERED="1"
+
+CMD ["bash"]

runner-image/requirements.lock

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+certifi==2026.6.17
+charset-normalizer==3.4.9
+idna==3.18
+iniconfig==2.3.0
+jalali_core==1.0.0
+jdatetime==6.0.1
+packaging==26.2
+pluggy==1.6.0
+Pygments==2.20.0
+pytest==9.1.1
+python-dotenv==1.2.2
+requests==2.34.2
+ruff==0.15.22
+urllib3==2.7.0