Adding a logo and NodeJS to the build image

build-image/Dockerfile

@@ -18,6 +18,11 @@ ARG FLUIDSYNTH_LITE_REF=c539a8d9270ba5a3f7d6e460606483fc2ab1eb61
 # Soundfont used for MIDI music, matching what engine/build_deps.sh itself
 # fetches (a free substitute for the Windows default GM soundfont).
 ARG SOUNDFONT_URL=http://rancid.kapsi.fi/windows.sf2
+# Gitea/GitHub Actions' JS-based actions (actions/checkout,
+# actions/upload-artifact, ...) need a node binary in the container job's
+# PATH - this image is otherwise pure C toolchain, so it isn't pulled in
+# by anything else.
+ARG NODE_VERSION=20.18.1
 
 ENV DEBIAN_FRONTEND=noninteractive
 
@@ -83,6 +88,13 @@ RUN git clone https://github.com/EtherTyper/fluidsynth-lite.git \
 RUN mkdir -p soundfont \
     && curl -sSL -o soundfont/default.sf2 "${SOUNDFONT_URL}"
 
+# Node.js: needed only so Gitea/GitHub Actions' JS-based actions can run
+# when this image is used as a CI job's container - see NODE_VERSION above.
+RUN curl -sSL -o /tmp/node.tar.xz \
+        "https://nodejs.org/dist/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-x64.tar.xz" \
+    && tar -xJf /tmp/node.tar.xz -C /usr/local --strip-components=1 \
+    && rm /tmp/node.tar.xz
+
 COPY build-image/docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
 COPY build-image/build-engine.sh /usr/local/bin/build-engine.sh
 RUN chmod +x /usr/local/bin/docker-entrypoint.sh /usr/local/bin/build-engine.sh