[CI]: Add Dockerfile for building docs

.dockerignore

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+# .git/
+
+build
+dist
+tools
+*.egg-info
+*.egg/
+*.pyc
+*.swp
+
+.tox
+.pytest_cache
+.ruff_cache
+.coverage
+html/*
+__pycache__
+
+# Compiled Documentation
+docs/_build

.github/workflows/docker-docs-publish.yml

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+name: Docker for docs
+
+# 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.
+
+on:
+  push:
+    # Only run when the file is edited on main
+    branches: [ "main" ]
+    paths: [ "Dockerfile-docs" ]
+  pull_request:
+    # Only run when the file is edited on main
+    branches: [ "main" ]
+    paths: [ "Dockerfile-docs" ]
+  workflow_dispatch: {}
+
+env:
+  # Use docker.io for Docker Hub if empty
+  REGISTRY: ghcr.io
+  # github.repository as <account>/<repo>
+  IMAGE_NAME: ${{ github.repository }}-docs
+
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # Install the cosign tool except on PR
+      # https://github.com/sigstore/cosign-installer
+      - name: Install cosign
+        if: github.event_name != 'pull_request'
+        uses: sigstore/cosign-installer@59acb6260d9c0ba8f4a2f9d9b48431a222b68e20 #v3.5.0
+        with:
+          cosign-release: 'v2.2.4'
+
+      # Set up BuildKit Docker container builder to be able to build
+      # multi-platform images and export cache
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
+        with:
+          context: .
+          file: Dockerfile-docs
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      # Sign the resulting Docker image digest except on PRs.
+      # This will only write to the public Rekor transparency log when the Docker
+      # repository is public to avoid leaking data.  If you would like to publish
+      # transparency data even for private images, pass --force to cosign below.
+      # https://github.com/sigstore/cosign
+      - name: Sign the published Docker image
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+          TAGS: ${{ steps.meta.outputs.tags }}
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+        # This step uses the identity token to provision an ephemeral certificate
+        # against the sigstore community Fulcio instance.
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

Dockerfile-docs

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+# syntax=docker/dockerfile:1
+
+FROM debian:bookworm-slim
+
+LABEL org.opencontainers.image.source=https://github.com/juaml/junifer
+LABEL org.opencontainers.image.description="Junifer docs CI container image"
+LABEL org.opencontainers.image.licenses=AGPL-3.0-only
+
+RUN apt-get update && \
+    apt-get install -y \
+    # ANTs runtime stuff
+    libhdf5-dev \
+    bc
+
+# Add xfms
+COPY --from=ghcr.io/juaml/human-template-xfms:main /opt/xfms /root/junifer/data/xfms
+# Add ANTs
+COPY --from=antsx/ants:latest /opt/ants /opt/ants
+# Set env vars for ANTs
+ENV PATH="/opt/ants/bin:$PATH" \
+    LD_LIBRARY_PATH="/opt/ants/lib"
+
+# Clean apt cache
+RUN apt-get autoremove --purge && apt-get clean

docs/changes/newsfragments/373.misc

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+Add Dockerfile for docs CI and a corresponding action for building and publishing the image by `Synchon Mandal`_