Fix broken Docusaurus preview links (#7185)

Author: zeme-wana

.github/workflows/docusaurus-site.yml

@@ -30,19 +30,34 @@ jobs:
         uses: actions/checkout@main
 
       - name: Build Site 
+        if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
         working-directory: doc/docusaurus
         run: nix develop --no-warn-dirty --accept-flake-config --command bash -c 'yarn && yarn build'
 
-      - name: Deploy Preview
-        if: github.event_name == 'pull_request' && github.event.action != 'closed'
-        uses: rossjrw/pr-preview-action@v1
-        with:
-          source-dir: doc/docusaurus/build
-
       - name: Deploy Site 
         if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
         uses: JamesIves/[email protected]
         with:
           folder: doc/docusaurus/build
           target-folder: docs
           single-commit: true
+
+      - name: Build Preview Site 
+        if: github.event_name == 'pull_request' && github.event.action != 'closed'
+        working-directory: doc/docusaurus
+        run: |
+          PR_NUMBER="${{ github.event.pull_request.number }}" 
+          # These match the URL expected by rossjrw/pr-preview-action@v1:
+          export DOCUSAURUS_URL="https://plutus.cardano.intersectmbo.org"
+          export DOCUSAURUS_BASE_URL="/pr-preview/pr-${PR_NUMBER}"
+          nix develop --no-warn-dirty --accept-flake-config --command bash -c 'yarn && yarn build'
+
+      - name: Deploy Preview Site 
+        if: github.event_name == 'pull_request' && github.event.action != 'closed'
+        uses: rossjrw/pr-preview-action@v1
+        with:
+          source-dir: doc/docusaurus/build
+
+
+      
+

doc/docusaurus/docusaurus.config.ts

@@ -8,11 +8,11 @@ const config: Config = {
   favicon: "img/favicon.ico",
 
   // Set the production url of your site here
-  url: "https://plutus.cardano.intersectmbo.org",
+  url: process.env.DOCUSAURUS_URL || "https://plutus.cardano.intersectmbo.org",
 
   // Set the /<baseUrl>/ pathname under which your site is served
   // For GitHub pages deployment, it is often '/<projectName>/'
-  baseUrl: "/docs/",
+  baseUrl: process.env.DOCUSAURUS_BASE_URL || "/docs/",
 
   // GitHub pages deployment config.
   // If you aren't using GitHub pages, you don't need these.