Switch to alpine and build q3asm.

This shrinks the image from ~200MB to ~30MB.

Dockerfile

@@ -1,23 +1,37 @@
-FROM debian:bookworm-slim AS builder
+FROM alpine:3.20.3 AS builder
 
 ARG TARGETOS
 ARG TARGETARCH
 
-RUN apt-get update -qq && apt-get install -qq --no-install-recommends build-essential bison
+RUN --mount=type=cache,id=${TARGETARCH}/var/cache/apk,target=/var/cache/apk \
+    apk add --update build-base bison
 
 ADD /q3lcc /opt/q3lcc
-WORKDIR /opt/q3lcc
+ADD /q3asm /opt/q3asm
 
-RUN make -j $(nproc) PLATFORM=${TARGETOS} ARCH=${TARGETARCH}
+WORKDIR /opt
+
+RUN cd q3lcc && make -j $(nproc) PLATFORM=${TARGETOS} ARCH=${TARGETARCH}
+RUN cd q3asm && make -j $(nproc)
 
 WORKDIR /opt/q3lcc/build-${TARGETOS}-${TARGETARCH}
+RUN install -s -m 0755 q3lcc q3cpp q3rcc /usr/local/bin/
+
+WORKDIR /opt/q3asm
+RUN install -s -m 0755 q3asm /usr/local/bin/
+
+FROM alpine:3.20.3
 
-RUN  install -s -m 0755 q3lcc q3cpp q3rcc /usr/local/bin/
+ARG TARGETOS
+ARG TARGETARCH
 
-FROM debian:bookworm-slim
+RUN --mount=type=cache,id=${TARGETARCH}/var/cache/apk,target=/var/cache/apk \
+    apk add --no-cache cmake bash ninja-build && rm /usr/bin/cpack /usr/bin/ctest
 
-RUN apt-get update -qq && apt-get install -qq --no-install-recommends build-essential cmake ninja-build && mkdir /src
+COPY --from=builder /usr/local/bin/q3asm /usr/local/bin/q3lcc /usr/local/bin/q3cpp /usr/local/bin/q3rcc /usr/local/bin/
 
-COPY --from=builder /usr/local/bin/q3lcc /usr/local/bin/q3cpp /usr/local/bin/q3rcc /usr/local/bin/
+# cmake needs to have some kind of cc installed, even if not used for regular C code
+ENV CC="q3lcc" \
+    PATH="$PATH:/usr/lib/ninja-build/bin"
 
 WORKDIR /src