Adding a Dockerfile and starting publishing node9 runtime

.dockerignore

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+Dockerfile
+.dockerignore

.github/workflows/publish.yaml

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+---
+name: Publish
+
+on:
+  push:
+    branches:
+      - "master"
+
+  # Allows to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+env:
+  IMAGE_NAME: "node9/runtime"
+
+jobs:
+  publish:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: |
+            ${{env.IMAGE_NAME}}:${{github.sha}}
+            ${{env.IMAGE_NAME}}:0.0.${{github.run_number}}

Dockerfile

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+# Using Ubuntu LTS to avoid dependency churn
+FROM ubuntu:20.04 as build
+
+ENV PREMAKE_URL https://github.com/premake/premake-core/releases/download/v5.0.0-alpha15/premake-5.0.0-alpha15-linux.tar.gz
+
+# install dependencies
+RUN apt update
+RUN apt install -y gcc make autoconf automake git wget libtool
+RUN wget -O- $PREMAKE_URL | tar -C /bin -xzvf -
+
+# copy source
+COPY . /node9
+
+# build libuv
+WORKDIR /node9/libuv
+RUN sh autogen.sh && ./configure
+RUN make -j "$(getconf _NPROCESSORS_ONLN)"
+RUN rm .libs/lib*.so* # forcing static build
+
+# build luajit
+WORKDIR /node9/luajit
+RUN make -j "$(getconf _NPROCESSORS_ONLN)"
+RUN rm src/lib*.so* # forcing static build
+
+# build node9
+WORKDIR /node9
+RUN premake5 gmake
+# FIXME: there must be a way to tell premake to do this
+RUN sed -i_ -e 's#^ndate:#ndate: lib9#' -e 's#^libnode9:#libnode9: ndate#' -e 's#^node9:#node9: libnode9#' Makefile
+RUN make config=debug_linux -j "$(getconf _NPROCESSORS_ONLN)"
+
+# Finally, build the runtime environment
+FROM ubuntu:20.04
+
+COPY --from=build /node9/bin/* /bin/
+COPY --from=build /node9/lib/* /lib/
+COPY --from=build /node9/fs    /fs
+
+# define entry point
+WORKDIR /
+ENV LD_LIBRARY_PATH /node9/lib
+ENTRYPOINT ["/bin/node9"]