Adding fix for service worker assets issue to deployment workflow.

.github/workflows/gh-pages.yaml

@@ -23,15 +23,53 @@ jobs:
         dotnet-version: 7.x
 
     - name: Publish with dotnet
-      run: dotnet publish --configuration Release --output build --nologo
+      run: dotnet publish --configuration Release --output release --nologo
 
+    # changes the base-tag in index.html to match GitHub Pages repository subdirectory
     - name: Change base-tag in index.html
-      run: sed -i 's/<base href="\/" \/>/<base href="\/amzn-bkmt\/" \/>/g' build/wwwroot/index.html
+      run: sed -i 's/<base href="\/" \/>/<base href="\/amzn-bkmt\/" \/>/g' release/wwwroot/index.html
 
+    # changes the base-tag in index.html from '/' to 'BlazorGitHubPagesDemo' to match GitHub Pages repository subdirectory
+    - name: Fix service-worker-assets.js hashes
+      working-directory: release/wwwroot
+      run: |
+        jsFile=$(<service-worker-assets.js)
+        # remove JavaScript from contents so it can be interpreted as JSON
+        json=$(echo "$jsFile" | sed "s/self.assetsManifest = //g" | sed "s/;//g")
+        # grab the assets JSON array
+        assets=$(echo "$json" | jq '.assets[]' -c)
+        for asset in $assets
+        do
+          oldHash=$(echo "$asset" | jq '.hash')
+          #remove leading and trailing quotes
+          oldHash="${oldHash:1:-1}"
+          path=$(echo "$asset" | jq '.url')
+          #remove leading and trailing quotes
+          path="${path:1:-1}"
+          newHash="sha256-$(openssl dgst -sha256 -binary $path | openssl base64 -A)"
+          
+          if [ $oldHash != $newHash ]; then
+            # escape slashes for json
+            oldHash=$(echo "$oldHash" | sed 's;/;\\/;g')
+            newHash=$(echo "$newHash" | sed 's;/;\\/;g')
+            echo "Updating hash for $path from $oldHash to $newHash"
+            # escape slashes second time for sed
+            oldHash=$(echo "$oldHash" | sed 's;/;\\/;g')
+            jsFile=$(echo -n "$jsFile" | sed "s;$oldHash;$newHash;g")
+          fi
+        done
+
+        echo -n "$jsFile" > service-worker-assets.js
+
+    # copy index.html to 404.html to serve the same file when a file is not found
+    - name: Copy index.html to 404.html
+      run: cp release/wwwroot/index.html release/wwwroot/404.html
+
+    # add .nojekyll file to tell GitHub pages to not treat this as a Jekyll project. (Allow files and folders starting with an underscore)
     - name: Add .nojekyll file
-      run: touch build/wwwroot/.nojekyll
+      run: touch release/wwwroot/.nojekyll
 
     - name: Deploy to Github Pages
       uses: JamesIves/github-pages-deploy-action@v4
       with:
-        folder: build/wwwroot
+        folder: release/wwwroot