Base workflow

.github/workflows/Dockerfile.base-build

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+FROM fpco/pid1:18.04
+
+ENV LANG C.UTF-8
+RUN export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update && \
+    apt-get install curl -y && \
+    curl -sSL https://get.haskellstack.org/ | sh && \
+    unset DEBIAN_FRONTEND
+RUN stack update
+COPY stack.yaml package.yaml /src/
+RUN stack setup --stack-yaml /src/stack.yaml
+RUN stack build --only-snapshot --stack-yaml /src/stack.yaml

.github/workflows/Dockerfile.base-run

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+FROM fpco/pid1:18.04
+
+RUN export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update && \
+    wget -qO- https://get.haskellstack.org/ | sh -x && \
+    apt-get install -y \
+      ca-certificates \
+      libgmp-dev \
+      netbase

.github/workflows/base.yml

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+name: Base image
+
+on:
+  push:
+    branches: [base]
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Log into Github registry
+        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login docker.pkg.github.com -u ${{ github.actor }} --password-stdin
+
+      - name: Build base run image
+        run: |
+          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/base-run:$GITHUB_SHA
+          docker build . -f .github/workflows/Dockerfile.base-run --tag $IMAGE_ID
+          docker push $IMAGE_ID
+          echo Pushed new base image $IMAGE_ID
+
+      - name: Build base build image
+        run: |
+          IMAGE_ID=docker.pkg.github.com/${{ github.repository }}/base-build:$GITHUB_SHA
+          docker build . -f .github/workflows/Dockerfile.base-build --tag $IMAGE_ID
+          docker push $IMAGE_ID
+          echo Pushed new base build image $IMAGE_ID