Add setup files and actions for chartpress

.github/workflows/publish-chart.yaml

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+# This is a GitHub workflow defining a set of jobs with a set of steps.
+# ref: https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions
+#
+name: Publish chart
+
+# Trigger the workflow on pushed tags or commits to main branch.
+on:
+  pull_request:
+    paths-ignore:
+      - "docs/**"
+      - "**.md"
+      - ".github/workflows/*"
+      - "!.github/workflows/publish-chart.yaml"
+  push:
+    paths-ignore:
+      - "docs/**"
+      - "**.md"
+      - ".github/workflows/*"
+      - "!.github/workflows/publish-chart.yaml"
+    branches-ignore:
+      - "dependabot/**"
+      - "pre-commit-ci-update-config"
+    tags:
+      - "**"
+
+jobs:
+  # Packages the Helm chart, and pushes it to 2i2c-org/unnamed-thingity-thing@gh-pages.
+  #
+  publish:
+    runs-on: ubuntu-22.04
+
+    # Explicitly request permissions to push to this git repository's gh-pages
+    # branch via the the GITHUB_TOKEN we can have access to.
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # chartpress needs git history
+          fetch-depth: 0
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Decide to publish or not
+        id: publishing
+        shell: python
+        run: |
+          import os
+          repo = "${{ github.repository }}"
+          event = "${{ github.event_name }}"
+          ref = "${{ github.event.ref }}"
+          publishing = ""
+          if (
+              repo == "2i2c-org/unnamed-thingity-thing"
+              and event == "push"
+              and (
+                  ref.startswith("refs/tags/")
+                  or ref == "refs/heads/main"
+              )
+          ):
+              publishing = "true"
+              print("Publishing chart")
+          with open(os.environ["GITHUB_OUTPUT"], "a") as f:
+              f.write(f"publishing={publishing}\n")
+
+      - name: Set up QEMU (for docker buildx)
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx (for chartpress multi-arch builds)
+        uses: docker/setup-buildx-action@v3
+
+      - name: Setup push rights to Quay.io
+        if: steps.publishing.outputs.publishing
+        run: |
+          docker login -u "${{ secrets.QUAY_USERNAME }}" -p "${{ secrets.QUAY_PASSWORD }}" quay.io
+
+      - name: Install dependencies
+        run: |
+          pip install -r dev-requirements.txt
+          pip list
+          helm version
+
+      - name: Configure a git user
+        run: |
+          git config --global user.email "[email protected]"
+          git config --global user.name "GitHub Actions user"
+
+      - name: Build image, push if necessary
+        env:
+          PUBLISHING: ${{ steps.publishing.outputs.publishing }}
+        run: |
+          CHARTPRESS_ARGS=""
+          if [[ "${PUBLISHING}" == "true" ]]; then
+            CHARTPRESS_ARGS="--push"
+          fi
+          chartpress \
+            --builder docker-buildx \
+            --platform linux/amd64 --platform linux/arm64 \
+            ${CHARTPRESS_ARGS}
+
+      - name: Publish chart with chartpress
+        if: steps.publishing.outputs.publishing
+        env:
+          GITHUB_TOKEN: "${{ github.token }}"
+        run: |
+          set -eux
+
+          PUBLISH_ARGS="--publish-chart --push"
+
+          if [[ $GITHUB_REF != refs/tags/* ]]; then
+              PR_OR_HASH=$(git log -1 --pretty=%h-%B | head -n1 | sed 's/^.*\(#[0-9]*\).*/\1/' | sed 's/^\([0-9a-f]*\)-.*/@\1/')
+              LATEST_COMMIT_TITLE=$(git log -1 --pretty=%B | head -n1)
+              EXTRA_MESSAGE="${{ github.repository }}${PR_OR_HASH} ${LATEST_COMMIT_TITLE}"
+              chartpress $PUBLISH_ARGS --extra-message "${EXTRA_MESSAGE}"
+          else
+              chartpress $PUBLISH_ARGS --tag "${GITHUB_REF:10}"
+          fi
+
+          git --no-pager diff --color

chartpress.yaml

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+# This is the configuration for chartpress, a CLI for Helm chart management.
+#
+# chartpress is used to:
+# - Build images
+# - Update Chart.yaml (version) and values.yaml (image tags)
+# - Package and publish Helm charts to a GitHub based Helm chart repository
+#
+# For more information, see the projects README.md file:
+# https://github.com/jupyterhub/chartpress
+#
+
+# This is the configuration for chartpress, a CLI for Helm chart management.
+#
+# chartpress is used to:
+# - Build images
+# - Update Chart.yaml (version) and values.yaml (image tags)
+# - Package and publish Helm charts to a GitHub based Helm chart repository
+#
+# For more information, see the projects README.md file:
+# https://github.com/jupyterhub/chartpress
+#
+charts:
+  - name: unnamed
+    chartPath: helm-chart
+    imagePrefix: quay.io/2i2c-org/
+    # Set dev version by taking latest tag and incrementing patch
+    baseVersion: patch
+
+    repo:
+      git: 2i2c-org/unnamed-thingity-thing
+      published: https://2i2c.org/unnamed-thingity-thing/
+
+    images:
+      unnamed:
+        dockerfilePath: Dockerfile
+        contextPath: .
+        valuesPath: image

dev-requirements.txt

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+# chartpress is important for local development, CI and CD
+# - builds images and can push them also (--push)
+# - updates image names and tags in values.yaml
+# - can publish the built Helm chart (--publish)
+#
+# ref: https://github.com/jupyterhub/chartpress
+#
+chartpress