adding start of base image for flux-core

note that there is a bug in spack that must be fixed for the
multistage build (the next container coming) to work.

Signed-off-by: vsoch <vsoch@users.noreply.github.com>

.github/workflows/build-container.yaml

@@ -0,0 +1,83 @@
+name: Build and Deploy Container
+
+on:
+
+  # Always have a base image ready to go - this is a nightly build
+  schedule:
+    - cron: 0 3 * * *
+
+  # Allow manual trigger of a build
+  workflow_dispatch:
+
+  # On push to main we build and deploy images
+  push:
+    branches:
+      - master
+
+  # Publish packages on release
+  release:
+    types: [published]
+
+jobs:
+  build:
+    if: github.repository == 'flux-framework/flux-core' # Don't run in forks
+    permissions:
+      packages: write
+    strategy:
+      fail-fast: false
+      matrix:
+
+        # Dockerfiles to build, a matrix supports future expanded builds
+        container: [["config/docker/Dockerfile.base", "ghcr.io/flux-framework/flux-core-base"]]
+                    # This will be enabled after the first container builds.
+                    #["config/docker/Dockerfile", "ghcr.io/flux-framework/flux-core-ubuntu"]]
+
+    runs-on: ubuntu-latest
+    name: Build
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Make Space For Build
+        run: |
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+
+       # It's easier to reference named variables than indexes of the matrix
+      - name: Set Environment
+        env:
+          dockerfile: ${{ matrix.container[0] }}
+          uri: ${{ matrix.container[1] }}
+        run: |
+          echo "dockerfile=$dockerfile" >> $GITHUB_ENV
+          echo "uri=$uri" >> $GITHUB_ENV
+
+      - name: Pull previous layers for cache
+        run: docker pull ${uri}:latest || echo "No container to pull"
+
+      - name: Build Container
+        run: |
+           container=$uri:latest
+           docker build -f ${dockerfile} -t ${container} .
+           echo "container=$container" >> $GITHUB_ENV
+
+      - name: GHCR Login
+        if: (github.event_name != 'pull_request')
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Deploy
+        if: (github.event_name != 'pull_request')
+        run: |
+            docker push ${container}
+
+      - name: Tag and Push Release
+        if: (github.event_name == 'release')
+        run: |
+            tag=${GITHUB_REF#refs/tags/}
+            echo "Tagging and releasing ${uri}:${tag}"
+            docker tag ${uri}:latest ${uri}:${tag}
+            docker push ${uri}:${tag}

etc/docker/Dockerfile.base

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+FROM ghcr.io/rse-ops/cuda:ubuntu-22.04-cuda-11.3.1
+
+# From flux-core root
+# docker build -f etc/docker/Dockerfile.base -t ghcr.io/flux-framework/flux-core-base .
+
+RUN apt-get update && \
+    apt-get install -y unzip gfortran python3-dev && \
+    spack compiler find && \
+    apt-get install -y libcurl4-openssl-dev libssl-dev && \
+    # py-jsonschema will fail without it
+    pip3 install tomli
+
+# /code is the working directory for code
+WORKDIR /code
+COPY . /code
+
+# This is for a spack environment/view to install from there
+RUN mkdir -p /opt/flux-env \
+&&  (echo "spack:" \
+&&   echo "  view:" \
+&&   echo "    mfem:" \
+&&   echo "      root: /opt/flux-view" \
+&&   echo "      link_type: copy" \
+&&   echo "  packages:" \
+&&   echo "    all:" \
+&&   echo "      target:" \
+&&   echo "      - x86_64_v3" \
+&&   echo "  config:" \
+&&   echo "    concretizer: clingo" \
+&&   echo "    compiler:" \
+&&   echo "      target:" \
+&&   echo "      - x86_64_v3" \
+&&   echo "    install_missing_compilers: true" \
+&&   echo "  concretization: together") > /opt/flux-env/spack.yaml
+
+RUN cd /opt/flux-env && \
+    . /opt/spack/share/spack/setup-env.sh && \
+    spack env activate . && \
+    spack develop --path /code flux-core@master && \
+    spack add flux-core@master && \
+    spack external find && \
+    spack mirror add develop https://binaries.spack.io/develop && \
+    spack install --use-cache --only dependencies

etc/docker/README.md

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+# Flux Core Docker
+
+We provide a [Dockerfile.base](Dockerfile.base) to build an ubuntu base image,
+and (will provide) a `Dockerfile` to build a smaller one with a multi-stage build. 🚧️
+
+Updated containers are built and deployed on merges to the master branch and releases.
+If you want to request a build on demand, you can [manually run the workflow](https://docs.github.com/en/actions/managing-workflow-runs/manually-running-a-workflow) thanks to the workflow dispatch event.
+
+### Usage
+
+Here is how to build the container. Note that we build so it belongs to the same
+namespace as the repository here. "ghcr.io" means "GitHub Container Registry" and
+is the [GitHub packages](https://github.com/features/packages) registry that supports
+ Docker images and other OCI artifacts. From the root of the repository:
+
+```bash
+$ docker build -f etc/docker/Dockerfile.base -t ghcr.io/flux-framework/flux-core-base .
+```
+
+**More will be added when the final flux container is developed**