ci(runner): add custom Docker runner and build-and-push workflow for Gitea registry

runner/Dockerfile

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+FROM debian:bookworm-slim
+
+LABEL maintainer="me0nline <me0nline@eibl.tech>"
+LABEL description="LOGAR CI/CD & Binary Release Cross-Compilation Runner"
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    PYTHONUNBUFFERED=1 \
+    LANG=C.UTF-8 \
+    LC_ALL=C.UTF-8
+
+# Install core build dependencies, NSIS compiler, and Python development packages
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    gcc \
+    make \
+    binutils \
+    curl \
+    wget \
+    git \
+    tar \
+    gzip \
+    zip \
+    unzip \
+    ca-certificates \
+    nsis \
+    nsis-common \
+    nsis-pluginapi \
+    python3 \
+    python3-dev \
+    libpython3-dev \
+    python3-pip \
+    python3-venv \
+    python3-setuptools \
+    python3-wheel \
+    libffi-dev \
+    libssl-dev \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Verify NSIS makensis binary
+RUN which makensis && makensis -VERSION
+
+# Verify Python and shared libraries
+RUN python3 --version && python3 -c "import sys; print('Python sys.path:', sys.path)"
+
+# Install PyInstaller and compilation dependencies system-wide
+RUN pip3 install --no-cache-dir --break-system-packages \
+    pyinstaller \
+    distlib \
+    cryptography \
+    pefile \
+    cffi \
+    pgpy \
+    fastapi \
+    uvicorn \
+    pydantic \
+    requests
+
+# Create workspace directory
+WORKDIR /workspace
+
+CMD ["/bin/bash"]

runner/README.md

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+# LOGAR Custom CI/CD Runner
+
+This directory contains the Docker configuration for the custom **LOGAR Build & Release Runner** (`gitea.eibl.tech/me0nline/logar-runner:latest`).
+
+---
+
+## Included Toolchains & Dependencies
+
+- **Operating System**: Debian 12 (Bookworm)
+- **Python Development**:
+  - `python3`, `python3-dev`, `libpython3-dev` (shared libraries for native ELF compilation)
+  - `python3-pip`, `python3-venv`, `python3-setuptools`, `python3-wheel`
+- **Native NSIS Cross-Compiler**:
+  - `nsis`, `nsis-common`, `nsis-pluginapi` (`makensis` CLI for compiling Windows `.exe` installers on Linux)
+- **Build Essentials**:
+  - `gcc`, `make`, `binutils`, `build-essential`, `libffi-dev`, `libssl-dev`
+- **Pre-installed Python Packages**:
+  - `pyinstaller`, `distlib`, `cryptography`, `pefile`, `pgpy`, `fastapi`, `uvicorn`, `pydantic`, `requests`
+
+---
+
+## Workflow Integration
+
+You can run CI/CD jobs directly inside this container image in `.gitea/workflows/`:
+
+```yaml
+jobs:
+  release:
+    name: Build & Release Standalone Binaries
+    runs-on: ubuntu-latest
+    container:
+      image: gitea.eibl.tech/me0nline/logar-runner:latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: python3 compilation/package_dist.py --target all
+```
+
+---
+
+## Building & Pushing the Runner
+
+Trigger the automated workflow [`.gitea/workflows/build-runner.yml`](../.gitea/workflows/build-runner.yml) via the Gitea Actions UI (Actions → Build and Push LOGAR Runner → Run Workflow) or push changes to the `runner/` folder.