skpkg: setup CI after migrating tests, src, requirements, and .github folder

.github/ISSUE_TEMPLATE/bug_feature.md

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+---
+name: Bug Report or Feature Request
+about: Report a bug or suggest a new feature!
+title: ""
+labels: ""
+assignees: ""
+---
+
+### Problem
+
+<!--
+For a bug report, please copy and paste any error messages from the application or command-line here.
+For a feature request, please state how the new functionality could benefit the community.
+-->
+
+### Proposed solution

.github/ISSUE_TEMPLATE/release_checklist.md

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+---
+name: Release
+about: Checklist and communication channel for PyPI and GitHub release
+title: "Ready for <version-number> PyPI/GitHub release"
+labels: "release"
+assignees: ""
+---
+
+### PyPI/GitHub rc-release preparation checklist:
+
+- [ ] All PRs/issues attached to the release are merged.
+- [ ] All the badges on the README are passing.
+- [ ] License information is verified as correct. If you are unsure, please comment below.
+- [ ] Locally rendered documentation contains all appropriate pages, including API references (check no modules are
+      missing), tutorials, and other human-written text is up-to-date with any changes in the code.
+- [ ] Installation instructions in the README, documentation, and the website are updated.
+- [ ] Successfully run any tutorial examples or do functional testing with the latest Python version.
+- [ ] Grammar and writing quality are checked (no typos).
+- [ ] Install `pip install build twine`, run `python -m build` and `twine check dist/*` to ensure that the package can be built and is correctly formatted for PyPI release.
+
+Please tag the maintainer (e.g., @username) in the comment here when you are ready for the PyPI/GitHub release. Include any additional comments necessary, such as version information and details about the pre-release here:
+
+### PyPI/GitHub full-release preparation checklist:
+
+- [ ] Create a new conda environment and install the rc from PyPI (`pip install <package-name>==??`)
+- [ ] License information on PyPI is correct.
+- [ ] Docs are deployed successfully to `https://<github-username-or-orgname>/<package-name>`.
+- [ ] Successfully run all tests, tutorial examples or do functional testing.
+
+Please let the maintainer know that all checks are done and the package is ready for full release.
+
+### conda-forge release preparation checklist:
+
+<!-- After the maintainer releases the PyPI package, please check the following when creating a PR for conda-forge release.-->
+
+- [ ] Ensure that the full release has appeared on PyPI successfully.
+- [ ] New package dependencies listed in `conda.txt` and `tests.txt` are added to `meta.yaml` in the feedstock.
+- [ ] Close any open issues on the feedstock. Reach out to the maintainer if you have questions.
+- [ ] Tag the maintainer for conda-forge release.
+
+### Post-release checklist
+
+<!-- Before closing this issue, please complete the following: -->
+
+- [ ] Run tutorial examples and conduct functional testing using the installation guide in the README. Attach screenshots/results as comments.
+- [ ] Documentation (README, tutorials, API references, and websites) is deployed without broken links or missing figures.

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+### What problem does this PR address?
+
+<!-- Provide a brief overview and link to the issue. Attach outputs, including screenshots (before/after), if helpful for the reviewer. -->
+
+### What should the reviewer(s) do?
+
+<!-- Merge the code, provide feedback, initiate a discussion, etc. -->
+
+<!--
+Use the following checklist items when applicable (select only what applies):
+- [ ] This PR introduces a public-facing change (e.g., figures, CLI input/output, API).
+    - [ ] Documentation (e.g., tutorials, examples, README) has been updated.
+    - [ ] A tracking issue or plan to update documentation exists.
+- [ ] This PR affects internal functionality only (no user-facing change).
+-->

.github/workflows/build-wheel-release-upload.yml

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+name: Release on GitHub
+
+on:
+  workflow_call:
+    secrets:
+      PAT_TOKEN:
+        description: "GitHub Personal Access Token"
+        required: true
+
+env:
+  TAG: ${{ github.ref_name }}
+
+defaults:
+  run:
+    shell: bash {0}
+
+jobs:
+  prepare-release:
+    if: ${{ ! contains(github.ref, 'rc') }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
+          ref: main
+
+      - name: Update CHANGELOG
+        run: |
+          wget https://raw.githubusercontent.com/scikit-package/release-scripts/v0/.github/workflows/update-changelog.py
+          python update-changelog.py "$TAG"
+          rm update-changelog.py
+
+      - name: Commit updated CHANGELOG.rst
+        run: |
+          git config user.name  "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add .
+          if ! git diff --cached --quiet; then
+            git commit -m "update changelog for $TAG"
+            git push origin main
+          else
+            echo "No CHANGELOG.rst changes"
+          fi
+
+      - name: New tag
+        run: |
+          git fetch --tags
+          git tag -d "$TAG" 2>/dev/null || true
+          git push origin ":$TAG" 2>/dev/null || true
+          git tag "$TAG"
+          git push origin "$TAG"
+
+      - name: Get CHANGELOG.txt
+        run: |
+          wget https://raw.githubusercontent.com/scikit-package/release-scripts/v0/.github/workflows/get-latest-changelog.py
+          python get-latest-changelog.py "$TAG"
+          rm get-latest-changelog.py
+
+      - name: Upload changelog.txt
+        uses: actions/upload-artifact@v4
+        with:
+          name: changelog
+          path: CHANGELOG.txt
+
+  release:
+    needs: [prepare-release]
+    if: always()
+    runs-on: ubuntu-latest
+    env:
+      REPO_FULL: ${{ github.repository }}
+      PAT_TOKEN: ${{ secrets.PAT_TOKEN }}
+    steps:
+      - name: Check prepare release
+        run: |
+          if [[ ${{ needs.prepare-release.result }} != 'success' && "$TAG" != *rc* ]]; then
+            echo "::error::Skipping release job because prepare-release failed"
+            exit 78
+          fi
+          echo "Continuing with release job"
+
+      - name: Download built wheels
+        uses: actions/download-artifact@v4
+        with:
+          path: dist/
+
+      - name: Download changelog
+        if: ${{ needs.prepare-release.result == 'success' }}
+        uses: actions/download-artifact@v4
+        with:
+          name: changelog
+          path: .
+
+      - name: Download instructions
+        uses: actions/download-artifact@v4
+        with:
+          name: instructions
+          path: .
+
+      - name: Zip wheels and instructions into dist/srxconfutils-$TAG-wheels.zip
+        run: |
+          mkdir -p dist
+          find dist -type f -name '*.whl' | zip -j dist/srxconfutils-"$TAG"-wheels.zip -@
+          zip -j dist/srxconfutils-"$TAG"-wheels.zip INSTRUCTIONS.txt
+
+      - name: Prepare release metadata
+        id: meta
+        run: |
+          if [[ "$TAG" == *rc* ]]; then
+            PRERELEASE=true
+            TITLE="Pre-release $TAG"
+            BODY_RAW="Changelog: https://github.com/$REPO_FULL/commits/$TAG"
+          else
+            PRERELEASE=false
+            TITLE="Release $TAG"
+            BODY_RAW=$(<CHANGELOG.txt)
+          fi
+
+          jq -n \
+            --arg tag "$TAG" \
+            --arg name "$TITLE" \
+            --arg body "$BODY_RAW" \
+            --argjson prerelease "$PRERELEASE" \
+            '{ tag_name: $tag,
+              name: $name,
+              body: $body,
+              prerelease: $prerelease
+            }' > payload.json
+
+            echo "Release metadata:"
+            cat payload.json
+
+      - name: Create GitHub Release
+        id: create_release
+        run: |
+          set -euo pipefail
+
+          HTTP_STATUS=$(
+            curl --silent --output resp.json --write-out "%{http_code}" \
+              -X POST "https://api.github.com/repos/$REPO_FULL/releases" \
+              -H "Accept: application/vnd.github+json" \
+              -H "Content-Type: application/json" \
+              -H "Authorization: Bearer $PAT_TOKEN" \
+              --data @payload.json
+          )
+          if [[ "$HTTP_STATUS" -ne 201 ]]; then
+            echo "::error::Failed to create release (status $HTTP_STATUS)"
+            exit 1
+          fi
+
+          UPLOAD_URL=$(jq -r .upload_url resp.json | sed 's/{.*}//')
+          echo "upload_url=$UPLOAD_URL" >> $GITHUB_OUTPUT
+
+      - name: Upload srxconfutils-$TAG-wheels.zip
+        if: steps.create_release.outputs.upload_url != ''
+        run: |
+          FILE=dist/srxconfutils-$TAG-wheels.zip
+          echo "Uploading asset: $FILE"
+          curl --silent --fail --data-binary @"$FILE" \
+            -H "Content-Type: application/zip" \
+            -H "Authorization: Bearer $PAT_TOKEN" \
+            "${{ steps.create_release.outputs.upload_url }}?name=$(basename "$FILE")"

.github/workflows/check-news-item.yml

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+name: Check for News
+
+on:
+  pull_request_target:
+    branches:
+      - main
+
+jobs:
+  check-news-item:
+    uses: scikit-package/release-scripts/.github/workflows/_check-news-item.yml@v0
+    with:
+      project: diffpy.srxconfutils

.github/workflows/matrix-and-codecov-on-merge-to-main.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  release:
+    types:
+      - prereleased
+      - published
+  workflow_dispatch:
+
+jobs:
+  matrix-coverage:
+    uses: scikit-package/release-scripts/.github/workflows/_matrix-no-codecov-on-merge-to-main.yml@v0
+    with:
+      project: diffpy.srxconfutils
+      c_extension: false
+      headless: false