Many imorovments

docker/android/Dockerfile

@@ -25,6 +25,9 @@ ARG NDK_VERSION=27.2.12479018
 ARG CMDLINE_TOOLS=13114758
 # Must satisfy cargo-ndk's MSRV (4.1.x needs >= 1.86) as well as our own crates.
 ARG RUST_VERSION=1.92.0
+# Gitea runs JavaScript actions (actions/checkout, actions/cache) with Node from
+# inside the job container. Bookworm ships 18; current actions expect 20+.
+ARG NODE_MAJOR=20
 
 # JDK 17, not the host's 25: the Android Gradle Plugin supports 17 as its
 # stable target, and newer JDKs regularly break Gradle in ways that cost more
@@ -51,6 +54,19 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         build-essential cmake python3 \
     && rm -rf /var/lib/apt/lists/*
 
+# ---------------------------------------------------------------------------
+# Node — required by the CI runner, not by the Android build
+#
+# This image is the job container for the Android CI job, and Gitea executes
+# actions/checkout inside it using the container's own Node. Without this the
+# job fails at checkout with "Cannot find: node in PATH", before any Rust or
+# Gradle step runs. Local builds never invoke it.
+# ---------------------------------------------------------------------------
+RUN curl -fsSL "https://deb.nodesource.com/setup_${NODE_MAJOR}.x" | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && rm -rf /var/lib/apt/lists/* \
+    && node --version
+
 # ---------------------------------------------------------------------------
 # Android SDK + NDK
 # ---------------------------------------------------------------------------