Initial commit, add Docker file and ci pipeline.

Dockerfile

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+FROM quay.io/jupyter/datascience-notebook
+
+USER root
+RUN apt update && apt -y --no-install-recommends upgrade
+USER ${NB_UID}
+RUN mamba install --yes \
+    sage \
+ && mamba clean --all -f -y \
+ && fix-permissions "${CONDA_DIR}" \
+ && fix-permissions "/home/${NB_USER}"
+

ci/pipeline.yml

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+---
+resource_types:
+- name: oci-image
+  type: registry-image
+  source:
+    repository: redxef/concourse-oci-resource
+    tag: latest
+
+resources:
+- name: source
+  type: git
+  source:
+    uri: https://gitea.redxef.at/redxef/jupyter-docker-spawner-image
+    branch: main
+    fetch_tags: true
+- name: upstream-image
+  type: registry-image
+  check_every: 6h
+  source:
+    repository: quay.io/jupyter/datascience-notebook
+- name: image
+  type: oci-image
+  source:
+    repository: redxef/jupyter-docker-spawner-image
+    tag: edge
+    username: ((docker.username))
+    password: ((docker.password))
+
+jobs:
+- name: build-push-edge
+  plan:
+  - get: source
+    trigger: true
+  - get: upstream-image
+    trigger: true
+  - task: compute-docker-tags
+    config:
+      platform: linux
+      image_resource:
+        type: registry-image
+        source:
+          repository: alpine/git
+      inputs:
+      - name: source
+        path: .
+      outputs:
+      - name: docker-tags
+      run:
+        path: sh
+        args:
+        - -c
+        - |
+          #!/usr/bin/env sh
+          git rev-parse --short HEAD > docker-tags/tags.txt
+          git show-ref --tags | \
+              sed -n "/$(git rev-parse HEAD)/ s|$(git rev-parse HEAD).refs/tags/||gp" \
+              >> docker-tags/tags.txt
+  - task: build
+    privileged: true
+    config:
+      platform: linux
+      image_resource:
+        type: registry-image
+        source:
+          repository: redxef/concourse-buildkit
+      inputs:
+      - name: source
+        path: .
+      outputs:
+      - name: build-output
+      params:
+        dest: build-output/image.tar
+        platform: aarch64,arm,i386,ppc64le,s390x,x86_64
+      run:
+        path: build
+  - put: image
+    inputs:
+    - build-output
+    - docker-tags
+    params:
+      image: build-output/image.tar
+      additional_tags: docker-tags/tags.txt
+
+- name: test
+  plan:
+  - get: image
+    trigger: true
+    passed:
+    - build-push-edge
+
+- name: tag-latest
+  plan:
+  - get: image
+    trigger: true
+    passed:
+    - test
+  - task: write-latest-file
+    config:
+      platform: linux
+      image_resource:
+        type: registry-image
+        source:
+          repository: alpine
+      outputs:
+      - name: latest-tag
+      run:
+        path: sh
+        args:
+        - -c
+        - |
+          #!/usr/bin/env sh
+          echo latest > latest-tag/tags.txt
+  - put: image
+    inputs:
+    - image
+    - latest-tag
+    params:
+      image: image/image.tar
+      additional_tags: latest-tag/tags.txt