feat: add self-contained gitea runner dockerfile with all build tools included

docker/runner/Dockerfile

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+# Use a base image that supports multi-arch (x64 and arm64)
+# We use debian:bookworm-slim as base to install everything manually
+# and then install the act_runner binary.
+FROM debian:bookworm-slim
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV PATH="/root/.cargo/bin:/root/.node/bin:/root/zig:${PATH}"
+
+# 1. Install Basic Dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    git \
+    build-essential \
+    ca-certificates \
+    wget \
+    xz-utils \
+    libssl-dev \
+    pkg-config \
+    # Needed for some crate compilations
+    protobuf-compiler \
+    && rm -rf /var/lib/apt/lists/*
+
+# 2. Install Node.js v20 (Manual install to support multi-arch cleanly)
+RUN ARCH=$(dpkg --print-architecture) && \
+    if [ "$ARCH" = "amd64" ]; then NODE_ARCH="x64"; \
+    elif [ "$ARCH" = "arm64" ]; then NODE_ARCH="arm64"; fi && \
+    NODE_VER="v20.11.1" && \
+    curl -fsSL "https://nodejs.org/dist/$NODE_VER/node-$NODE_VER-linux-$NODE_ARCH.tar.xz" -o node.tar.xz && \
+    mkdir -p /root/.node && \
+    tar -xJf node.tar.xz -C /root/.node --strip-components=1 && \
+    rm node.tar.xz
+
+# 3. Install Rust (Nightly) + Targets
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly --profile minimal && \
+    . "$HOME/.cargo/env" && \
+    rustup target add wasm32-unknown-unknown && \
+    rustup target add mips-unknown-linux-musl && \
+    rustup component add rust-src
+
+# 4. Install Zig (for Cross Compilation)
+RUN ARCH=$(dpkg --print-architecture) && \
+    if [ "$ARCH" = "amd64" ]; then ZIG_ARCH="x86_64"; \
+    elif [ "$ARCH" = "arm64" ]; then ZIG_ARCH="aarch64"; fi && \
+    ZIG_VER="0.13.0" && \
+    curl -fsSL "https://ziglang.org/download/$ZIG_VER/zig-linux-$ZIG_ARCH-$ZIG_VER.tar.xz" -o zig.tar.xz && \
+    tar -xf zig.tar.xz && \
+    mv "zig-linux-$ZIG_ARCH-$ZIG_VER" /root/zig && \
+    rm zig.tar.xz
+
+# 5. Install Tools (Trunk, cargo-zigbuild, wasm-bindgen protocol aligned)
+# We install trunk binary to save time, others via cargo
+RUN . "$HOME/.cargo/env" && \
+    # Install cargo-zigbuild
+    cargo install cargo-zigbuild && \
+    # Install trunk (Binary)
+    ARCH=$(dpkg --print-architecture) && \
+    if [ "$ARCH" = "amd64" ]; then TRUNK_ARCH="x86_64-unknown-linux-gnu"; \
+    elif [ "$ARCH" = "arm64" ]; then TRUNK_ARCH="aarch64-unknown-linux-gnu"; fi && \
+    wget -qO- "https://github.com/trunk-rs/trunk/releases/download/v0.21.5/trunk-$TRUNK_ARCH.tar.gz" | tar -xzf - -C /root/.cargo/bin/ && \
+    chmod +x /root/.cargo/bin/trunk && \
+    # Install wasm-bindgen-cli (Compiling from source to avoid glibc issues, doing it ONCE here)
+    cargo install wasm-bindgen-cli --version 0.2.108
+
+# 6. Install Gitea Act Runner Binary
+# We fetch the binary directly to run as the entrypoint
+RUN ARCH=$(dpkg --print-architecture) && \
+    VERSION="0.2.11" && \
+    curl -fsSL -o /usr/local/bin/act_runner "https://gitea.com/gitea/act_runner/releases/download/v$VERSION/act_runner-$VERSION-linux-$ARCH" && \
+    chmod +x /usr/local/bin/act_runner
+
+# Create a volume for registration data
+VOLUME /data
+WORKDIR /data
+
+# Define entrypoint to run the registration or daemon
+# We will use a script to handle auto-registration if env vars are present
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

docker/runner/entrypoint.sh

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+#!/bin/bash
+set -e
+
+# If GITEA_INSTANCE_URL and GITEA_RUNNER_TOKEN are provided, try to register
+if [ -n "$GITEA_INSTANCE_URL" ] && [ -n "$GITEA_RUNNER_TOKEN" ]; then
+    if [ ! -f ".runner" ]; then
+        echo "Registering runner..."
+        act_runner register \
+          --instance "$GITEA_INSTANCE_URL" \
+          --token "$GITEA_RUNNER_TOKEN" \
+          --name "custom-mips-runner-$(hostname)" \
+          --no-interactive
+    else
+        echo "Runner already registered."
+    fi
+fi
+
+# Run the daemon
+echo "Starting act_runner daemon..."
+exec act_runner daemon