conda environment + dockerfile

.github/workflows/build_docker.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Create and publish a Docker image
+
+on:
+  push:
+    branches:
+      - "!*"
+    tags:
+      - "v*"
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          file: docker/Dockerfile

docker/Dockerfile

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+FROM condaforge/mambaforge 
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install ssh (missing dependency to run conda envs)
+RUN apt-get update && \
+    apt-get install -y ssh build-essential
+
+# Upgrade mamba
+RUN mamba upgrade -y mamba
+
+# Copy environment and requirements files into docker env
+COPY environment.yml .
+
+# Update environment file with new environment name
+RUN mamba env update --file environment.yml --name dockerenv
+SHELL ["mamba", "run", "-n", "dockerenv", "/bin/bash", "-c"]
+
+# Install package
+COPY . ffian/ 
+RUN python3 -m pip install ./ffian
+
+RUN echo "source activate dockerenv" > ~/.bashrc

environment.yml

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+name: test-env
+channels:
+  - conda-forge
+dependencies:
+  - fenics-dolfin
+  - numpy
+  - python=3.10