fix(github-actions): speed up builds inside WSL by leveraging virtual FS

Instead of building from inside WSL but referencing the host windows
file system (which is known slowness gotcha), we should build fully
inside the WSL environment.

Author: devversion

github-actions/setup-wsl/action.yml

@@ -35,6 +35,9 @@ outputs:
   wsl_root_unc_path:
     description: UNC Windows path pointing to the WSL file system root.
     value: \\\\wsl.localhost\Debian
+  repo_path:
+    description: Path to the copied repository directory
+    value: ${{steps.disk_path.outputs.repo}}
 
 runs:
   using: composite
@@ -91,17 +94,28 @@ runs:
       shell: powershell
       run: New-Item -ItemType SymbolicLink -Path "C:\wsl_root" -Target "\\wsl.localhost\Debian"
 
+    - name: Linking workspace into WSL for fast disk access
+      shell: wsl-bash {0}
+      id: disk_path
+      env:
+        WSLENV: 'GITHUB_OUTPUT/p'
+      run: |
+        mkdir $HOME/repo
+        cp -R ./* $HOME/repo/
+        echo "repo=$(wslpath -w $HOME/repo)" >> $GITHUB_OUTPUT
+
     - name: Cache for nvm, yarn profile caches.
       uses: actions/cache@v4
       with:
         path: |
-          C:\wsl_root\Debian\root\.nvm\versions
-          C:\wsl_root\Debian\root\.yarn\berry\cache
+          C:\\wsl_root\\Debian\\root\\.nvm\\versions
+          C:\\wsl_root\\Debian\\root\\.yarn\\berry\cache
         key: "${{ runner.os }}-wsl-cache-v${{inputs.cache_version}}-${{hashFiles('**/.nvmrc')}}-${{hashFiles('**/yarn.lock')}}"
         restore-keys: |
           ${{ runner.os }}-wsl-cache-v${{inputs.cache_version}}-
 
     - name: Setup nvm
+      working-directory: ${{steps.paths.outputs.repo}}
       shell: wsl-bash {0}
       run: |
         curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/master/install.sh | bash
@@ -110,6 +124,8 @@ runs:
         [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" --install
 
     - run: nvm install
+      working-directory: ${{steps.paths.outputs.repo}}
       shell: wsl-bash {0}
     - run: npm install -g yarn@1
+      working-directory: ${{steps.paths.outputs.repo}}
       shell: wsl-bash {0}