Prospective fix for failing external pull requests

Run the doc stuff only when building for the master branch

.github/workflows/build_docs.yaml

@@ -106,13 +106,8 @@ jobs:
                   npm run docs
               working-directory: api/node            
 
-            - name: check for secrets
-              id: secrets
-              run: |                    
-                [ -n "${{ secrets.READ_WRITE_PRIVATE_KEY }}" ] && echo "has-website-secrets=yes" >> "$GITHUB_OUTPUT"
-
             - name: Generate a token
-              if: ${{ steps.secrets.outputs.has-website-secrets }}
+              if: ${{ github.ref == 'refs/heads/master' }}
               id: app-token
               uses: actions/create-github-app-token@v1
               with:
@@ -121,7 +116,7 @@ jobs:
                 repositories: website
         
             - name: Clone website directory
-              if: ${{ steps.secrets.outputs.has-website-secrets }}
+              if: ${{ github.ref == 'refs/heads/master' }}
               uses: actions/checkout@v4
               with:
                 repository: slint-ui/website
@@ -131,13 +126,13 @@ jobs:
                 persist-credentials: false
       
             - name: Generate release-docs.html and 404.html
-              if: ${{ steps.secrets.outputs.has-website-secrets }}
+              if: ${{ github.ref == 'refs/heads/master' }}
               run: |
                 mkdir -p website/output
                 cd website && go run generator/generator.go -skip-agreements
       
             - name: Copy release-docs.html and 404.html
-              if: ${{ steps.secrets.outputs.has-website-secrets }}
+              if: ${{ github.ref == 'refs/heads/master' }}
               run: |
                 cp website/output/release-docs.html docs/site/index.html
                 cp website/output/404.html docs/site/404.html