initial version

.github/workflows/buiild.yml

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+name:  Build and publish image to ghcr.io/epics-containers
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Determine container image tag to use
+        id: tag
+        run: |
+          # tag is branch name or tag if there is a tag
+          echo ::set-output name=image_tag::${GITHUB_REF##*/}
+          echo ::set-output name=do_push::true
+
+      - name: Cache Docker layers
+        uses: actions/cache@v3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Log in to GitHub Docker Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io/epics-containers
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build developer image
+        uses: docker/build-push-action@v5
+        with:
+          builder: ${{ steps.buildx.outputs.name }}
+          push: ${{ steps.tag.outputs.do_push }}
+          tags: |
+            ghcr.io/${{ github.repository }}:latest
+            ghcr.io/${{ github.repository }}:${{ steps.tag.outputs.image_tag }}
+
+      # - name: Build runtime image
+      #   uses: docker/build-push-action@v5
+      #   with:
+      #     builder: ${{ steps.buildx.outputs.name }}
+      #     push: ${{ steps.tag.outputs.do_push }}
+      #     tags: |
+      #       ghcr.io/${{ github.repository }}:${{ steps.tag.outputs.image_tag }}.run
+      #     target: runtime
+      #     cache-from: type=local,src=/tmp/.buildx-cache
+      #     cache-to: type=local,dest=/tmp/.buildx-cache
+

Dockerfile

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+FROM python:3.11
+
+RUN python -mvenv /venv
+ENV PATH=/venv/bin:$PATH
+
+# don't use numpy 2.0 yet, pin to latest 1.x version
+RUN pip install numpy=1.26.4 p4p nose2
+