CI: consolidate docs deployment workflows and add PR previews

.github/workflows/publish-docs.yml

@@ -0,0 +1,109 @@
+name: Publish Docs
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  workflow_dispatch:
+    inputs:
+      pr_number:
+        description: 'PR number to deploy preview for'
+        required: true
+        type: number
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: site
+          path: build/
+
+  deploy-pr-preview:
+    if: ${{ github.event_name == 'workflow_dispatch' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Find latest run ID
+        id: find-run
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          BRANCH=$(gh pr view ${{ inputs.pr_number }} --json headRefName --jq .headRefName)
+          echo "Found branch: $BRANCH"
+          RUN_ID=$(gh run list --workflow "Publish Docs" --branch "$BRANCH" --event pull_request --status success --limit 1 --json databaseId --jq '.[0].databaseId')
+          echo "Found run ID: $RUN_ID"
+          if [ -z "$RUN_ID" ]; then
+            echo "::error::No successful 'Publish Docs' run found for PR #${{ inputs.pr_number }} (branch: $BRANCH)"
+            exit 1
+          fi
+          echo "run_id=$RUN_ID" >> $GITHUB_OUTPUT
+
+      - name: Download build artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: site
+          path: site
+          run-id: ${{ steps.find-run.outputs.run_id }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Deploy PR Preview
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          branch: gh-pages-pr-previews
+          folder: site
+          target-folder: pr-${{ inputs.pr_number }}
+
+      - name: Comment Preview URL
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          recreate: true
+          number: ${{ inputs.pr_number }}
+          message: |
+            🚀 **Preview Ready!**
+            Your docs preview for this PR is available here:
+
+            **https://${{ github.repository_owner }}.github.io/${{ github.event.repository.name }}/pr-${{ inputs.pr_number }}/**
+
+  deploy-production:
+    if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Download build artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: site
+          path: site
+
+      - name: Deploy to GitHub Pages
+        uses: JamesIves/github-pages-deploy-action@v4
+        with:
+          branch: gh-pages
+          folder: site

docusaurus.config.js

@@ -4,7 +4,7 @@ module.exports = {
   tagline:
     "Ecosystem science, policy, and management informed by the best available data and models",
   url: "https://pecanproject.github.io",
-  baseUrl: "/",
+  baseUrl: process.env.BASE_URL || "/",
   onBrokenLinks: "ignore",
   onBrokenMarkdownLinks: "warn",
   favicon: "img/favicon.ico",