Add workflows for unstable dependencies

.github/workflows/nightly-builds.yml

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+name: Nightly Checks
+
+on:
+  schedule:
+  # Runs at 09Z (3am MDT)
+    - cron: "0 9 * * 2"
+
+  # Allow a manual run
+  workflow_dispatch:
+
+  # Run if we modify the workflow
+  push:
+    branches:
+      - main
+    paths:
+      - .github/workflows/nightly-builds.yml
+      - .github/workflows/unstable-builds.yml
+  pull_request:
+    paths:
+      - .github/workflows/nightly-builds.yml
+      - .github/workflows/unstable-builds.yml
+
+jobs:
+  Builds:
+    uses: ./.github/workflows/unstable-builds.yml
+
+  Report:
+    name: Report
+    needs: Builds
+    if: failure() || github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+
+    steps:
+      - name: Download logs
+        uses: actions/download-artifact@v4
+        with:
+          path: /tmp/workspace/logs
+
+      - name: Grab log files
+        run: |
+          cp /tmp/workspace/logs/log-*/*.log . || true
+          touch tests-nightly.log build.log linkchecker.log
+
+      - name: Report failures
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const fs = require('fs');
+            const title = "Nightly build is failing";
+            const workflow_url = `https://github.com/${process.env.GITHUB_REPOSITORY}/actions/runs/${process.env.GITHUB_RUN_ID}`;
+            body = `The [Nightly workflow](${workflow_url}) is failing.\n`;
+
+            if ('${{ needs.Builds.outputs.tests_result }}' === 'failure') {
+              const test_log = fs.readFileSync('tests-nightly.log', 'utf8').substring(0, 21000);
+              body += `The tests failed.\nLog:\n<details><pre>${test_log}</pre></details>`;
+            }
+            if ('${{ needs.Builds.outputs.docs_result }}' === 'failure') {
+              const build_log = fs.readFileSync('build.log', 'utf8').substring(0, 21000);
+              const linkchecker = fs.readFileSync('linkchecker.log', 'utf8').substring(0, 21000);
+              body += `The documentation build failed.\nLog:\n<details><pre>${build_log}</pre></details>`;
+              body += `\nLinkchecker output:\n<details><pre>${linkchecker}</pre></details>`;
+            }
+
+            // See if we have an existing issue
+            const items = await github.rest.issues.listForRepo({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              state: 'open',
+              creator: 'github-actions[bot]'
+            });
+            const existing = items.data.filter(i => i.title === title);
+
+            params = {
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: body,
+              title: title,
+              labels: ['Type: Maintenance']
+            };
+
+            // On PRs, avoid actually issuing an API request, since we don't have permission
+            if ( context.eventName === 'pull_request' ) {
+              github.hook.wrap('request', (request, options) => { return {}; })
+            }
+
+            if (existing.length === 0) {
+                console.log('Creating new issue.')
+                github.rest.issues.create(params)
+            } else {
+                params.issue_number = existing[0].number;
+                console.log(`Updating existing issue: ${params.issue_number}`)
+                github.rest.issues.update(params)
+            }

.github/workflows/run-unstable-pr.yml

@@ -0,0 +1,16 @@
+name: PR Unstable Builds
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+      - labeled
+
+jobs:
+  Builds:
+    if: |
+      ((github.event.action == 'labeled' && github.event.label.name == 'nightly-ci') ||
+       contains(github.event.pull_request.labels.*.name, 'nightly-ci'))
+    uses: ./.github/workflows/unstable-builds.yml

.github/workflows/unstable-builds.yml

@@ -0,0 +1,93 @@
+name: Unstable Builds
+
+on:
+  workflow_call:
+    outputs:
+      tests_result:
+        description: "Result from running tests"
+        value: ${{ jobs.Tests.outputs.result }}
+      docs_result:
+        description: "Result from running docs"
+        value: ${{ jobs.Docs.outputs.result }}
+
+jobs:
+  Tests:
+    runs-on: ubuntu-latest
+    outputs:
+      result: ${{ steps.tests.outcome }}
+    steps:
+    - name: Checkout source
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 150
+        fetch-tags: true
+
+    - name: Assemble test requirements
+      run: |
+        echo git+https://github.com/pydata/xarray@main#egg=xarray > ci/extra_requirements.txt
+
+    - name: Install using PyPI
+      uses: Unidata/MetPy/.github/actions/install-pypi@main
+      with:
+        need-extras: true
+        type: test
+        version-file: Prerelease
+        python-version: 3.12
+        need-cartopy: 'false'
+
+    - name: Run tests
+      id: tests
+      uses: Unidata/MetPy/.github/actions/run-tests@main
+      with:
+        run-doctests: false
+        key: nightly
+        upload-coverage: false
+        pytest-args: ''
+
+    - name: Upload test log
+      if: failure()
+      uses: actions/upload-artifact@v4
+      with:
+        name: log-nightly-tests
+        path: tests-nightly.log
+        retention-days: 5
+
+  Docs:
+    runs-on: ubuntu-latest
+    outputs:
+      result: ${{ steps.build.outcome }}
+    steps:
+    - name: Checkout source
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 150
+        fetch-tags: true
+
+    - name: Assemble doc requirements
+      run: |
+        echo git+https://github.com/pydata/xarray@main#egg=xarray > ci/extra_requirements.txt
+
+    - name: Install using PyPI
+      uses: Unidata/MetPy/.github/actions/install-pypi@main
+      with:
+        type: doc
+        version-file: Prerelease
+        python-version: 3.12
+
+    - name: Build docs
+      id: build
+      uses: Unidata/MetPY/.github/actions/build-docs@main
+      with:
+        run-linkchecker: true
+        key: nightly
+        make-targets: ''
+
+    - name: Upload build log
+      if: failure()
+      uses: actions/upload-artifact@v4
+      with:
+        name: log-nightly-docs
+        path: |
+          build.log
+          linkchecker.log
+        retention-days: 5