Hi, analyse of there is ability to get any serios optimizations in this gihtub action.
```yaml
name: Build Corretto 21 lilliput-2 for Windows

on:
  schedule:
    - cron: '0 5 * * 1'
  workflow_dispatch:

env:
  UPSTREAM_REPO: corretto/corretto-21
  UPSTREAM_BRANCH: lilliput-2
  GITHUB_VARIABLE_NAME: LAST_BUILT_CORRETTO_LILLIPUT_SHA
  CORRETTO_SOURCE_DIR: corretto_source_checkout
  CYGWIN_PACKAGES: make,coreutils,diffutils,binutils,zip,unzip,autoconf,automake

jobs:
  build_if_new_commits:
    runs-on: windows-2025
    permissions:
      contents: read
      actions: read
    steps:
      # 1. Read the Last Built Upstream SHA from GitHub Repository Variable
      - name: Read Last Built Upstream SHA from GitHub Variable
        id: read_last_sha
        run: |
          $sha_from_var = "${{ vars[env.GITHUB_VARIABLE_NAME] || '' }}"
          echo "last_sha=$sha_from_var" >> $GITHUB_OUTPUT
          Write-Host "Last built upstream SHA read from variable '${{ env.GITHUB_VARIABLE_NAME }}': '$sha_from_var'"
        shell: pwsh

      # 2. Checkout the upstream repository in one step (shallow clone)
      - name: Checkout upstream repository
        id: checkout_upstream
        uses: actions/checkout@v4
        with:
          repository: ${{ env.UPSTREAM_REPO }}
          ref: ${{ env.UPSTREAM_BRANCH }}
          fetch-depth: 1
          path: ${{ env.CORRETTO_SOURCE_DIR }}

      # 3. Get current upstream SHA from the checked-out repository
      - name: Get Current Upstream SHA
        id: get_upstream_sha
        working-directory: ${{ env.CORRETTO_SOURCE_DIR }}
        run: |
          $current_sha = (git rev-parse HEAD).Trim()
          Write-Host "Current upstream SHA determined for $env.UPSTREAM_BRANCH: '$current_sha'"
          echo "sha=$current_sha" >> $env:GITHUB_OUTPUT
        shell: pwsh

      # 4. Determine if build is needed
      - name: Determine if Build is Needed
        id: check_build_condition
        run: |
          $last_sha = "${{ steps.read_last_sha.outputs.last_sha }}"
          $current_sha = "${{ steps.get_upstream_sha.outputs.sha }}"
          $needs_build_ps_var = "false"
          if ("${{ github.event_name }}" -eq "workflow_dispatch") {
            $needs_build_ps_var = "true"
            Write-Host "Manual dispatch (workflow_dispatch): Build is forced."
          } elseif ($last_sha -ne $current_sha) {
            $needs_build_ps_var = "true"
            Write-Host "Upstream SHA has changed (was '$last_sha', now '$current_sha'). Build needed."
          } else {
            Write-Host "Upstream SHA ('$current_sha') matches last built SHA. No build needed."
          }
          echo "needs_build=$needs_build_ps_var" >> $env:GITHUB_OUTPUT
        shell: pwsh

      # 5. Update GitHub Repository Variable with the new SHA (only if build is needed)
      - name: Update GitHub Repository Variable with PAT
        if: steps.check_build_condition.outputs.needs_build == 'true'
        env:
          NEW_SHA_TO_SAVE: ${{ steps.get_upstream_sha.outputs.sha }}
          GH_TOKEN: ${{ secrets.MY_PAT }}
          TARGET_VARIABLE_NAME: LAST_BUILT_CORRETTO_LILLIPUT_SHA
        run: |
          gh variable set "${TARGET_VARIABLE_NAME}" --body "${NEW_SHA_TO_SAVE}" --repo "${{ github.repository }}"
        shell: bash

      # 6. Set up Corretto 21 as Bootstrap JDK
      - name: Set up Corretto 21 as Bootstrap JDK
        if: steps.check_build_condition.outputs.needs_build == 'true'
        uses: actions/setup-java@v4
        with:
          distribution: 'corretto'
          java-version: '21'
          architecture: x64
        id: setup_jdk

      # 7. Cache Cygwin installation (note: consider additional caches for build artifacts if beneficial)
      - name: Cache Cygwin installation
        if: steps.check_build_condition.outputs.needs_build == 'true'
        id: cache-cygwin
        uses: actions/cache@v4
        with:
          path: C:\cygwin64
          key: ${{ runner.os }}-cygwin-packages-${{ hashFiles(env.CYGWIN_PACKAGES) }}

      # 8. Install Cygwin with necessary packages (only if not already cached)
      - name: Install Cygwin with necessary packages (if not cached)
        if: steps.check_build_condition.outputs.needs_build == 'true' && steps.cache-cygwin.outputs.cache-hit != 'true'
        run: |
          choco install cygwin --params "/InstallDir:C:\cygwin64 /NoAdmin" -y
          $cygwinSetupPath = "C:\cygwin64\cygwinsetup.exe"
          if (-not (Test-Path $cygwinSetupPath -PathType Leaf)) { 
            Write-Error "Cygwin setup executable ($cygwinSetupPath) not found!"; 
            exit 1 
          }
          $cygwinMirror = "https://mirrors.kernel.org/sourceware/cygwin/"
          Write-Host "Installing Cygwin packages: $env.CYGWIN_PACKAGES"
          Start-Process -FilePath $cygwinSetupPath -ArgumentList "-q -s $cygwinMirror -P $env:CYGWIN_PACKAGES" -Wait -NoNewWindow
          if ($LASTEXITCODE -ne 0) { 
            Write-Error "Cygwin setup exited with code $LASTEXITCODE."; 
            exit $LASTEXITCODE 
          }
        shell: pwsh

      # 9. Add Cygwin to PATH
      - name: Add Cygwin to PATH
        if: steps.check_build_condition.outputs.needs_build == 'true'
        run: echo "C:\cygwin64\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
        shell: pwsh

      # 10. Configure Corretto Build using the bootstrap JDK
      - name: Configure Corretto Build
        if: steps.check_build_condition.outputs.needs_build == 'true'
        working-directory: ${{ env.CORRETTO_SOURCE_DIR }}
        run: |
          $BOOT_JDK_WINDOWS = $env:JAVA_HOME
          if (-not $BOOT_JDK_WINDOWS) { 
            Write-Error "Bootstrap JDK path from JAVA_HOME is empty!"; 
            exit 1 
          }
          # Convert Windows path to Cygwin style
          $BOOT_JDK_CYGWIN = (& cygpath --unix $BOOT_JDK_WINDOWS).Trim()
          Write-Host "Using Bootstrap JDK (Cygwin path): $BOOT_JDK_CYGWIN"
          C:\cygwin64\bin\bash -c "./configure --with-boot-jdk='$BOOT_JDK_CYGWIN' --disable-warnings-as-errors --with-debug-level=release"
        shell: pwsh

      # 11. Build Corretto using parallel execution (using all available processors)
      - name: Build Corretto (make images)
        if: steps.check_build_condition.outputs.needs_build == 'true'
        working-directory: ${{ env.CORRETTO_SOURCE_DIR }}
        run: |
          # Use getconf to fetch the number of processors in Cygwin and run make in parallel.
          C:\cygwin64\bin\bash -c "make JOBS=\$(getconf _NPROCESSORS_ONLN) images"
        shell: pwsh

      # 12. Clean Debug Symbols from JDK Image
      - name: Clean Debug Symbols from JDK Image
        if: steps.check_build_condition.outputs.needs_build == 'true'
        working-directory: ${{ env.CORRETTO_SOURCE_DIR }}
        run: |
          $jdkImagePath = Get-ChildItem -Path "build\*\images\jdk" -Directory | Select-Object -First 1 -ExpandProperty FullName
          if ($jdkImagePath) {
            Write-Host "Cleaning *.pdb and *.map files from $jdkImagePath"
            Get-ChildItem -Path $jdkImagePath -Recurse -Include "*.pdb", "*.map" | Remove-Item -Force -ErrorAction SilentlyContinue
          } else {
            Write-Warning "Could not find JDK image directory to clean."
          }
        shell: pwsh

      # 13. Prepare Artifact Structure (extract version info and repackage the build)
      - name: Prepare Artifact Structure
        if: steps.check_build_condition.outputs.needs_build == 'true'
        id: prepare_artifact
        working-directory: ${{ env.CORRETTO_SOURCE_DIR }}
        run: |
          $jdkSourcePath = Get-ChildItem -Path "build\*\images\jdk" -Directory | Select-Object -First 1 -ExpandProperty FullName
          if (-not $jdkSourcePath) { 
            Write-Error "Could not find source JDK image directory"; 
            exit 1 
          }
          $releaseFile = Join-Path $jdkSourcePath "release"
          if (-not (Test-Path $releaseFile)) { 
            Write-Error "Could not find release file at $releaseFile"; 
            exit 1 
          }
          $releaseContent = Get-Content $releaseFile -Raw | ConvertFrom-StringData -Delimiter '='
          $javaVersion = $releaseContent.JAVA_VERSION.Trim('"')
          if (-not $javaVersion) { 
            Write-Error "Could not parse JAVA_VERSION from release file"; 
            exit 1 
          }
          Write-Host "Extracted JAVA_VERSION: $javaVersion"
          echo "JAVA_VERSION_EXTRACTED=$javaVersion" >> $GITHUB_OUTPUT
          $stagingDir = Join-Path $env:GITHUB_WORKSPACE "staging_artifact"
          $targetDirName = "corretto-21-lilliput-${javaVersion}"
          $fullTargetPathInStaging = Join-Path $stagingDir $targetDirName
          if (Test-Path $stagingDir) { Remove-Item -Recurse -Force $stagingDir }
          New-Item -ItemType Directory -Path $fullTargetPathInStaging | Out-Null
          Move-Item -Path (Join-Path $jdkSourcePath "*") -Destination $fullTargetPathInStaging -Force
        shell: pwsh

      # 14. Upload Windows JDK Build Artifact
      - name: Upload Windows JDK Build Artifact
        if: steps.check_build_condition.outputs.needs_build == 'true'
        uses: actions/upload-artifact@v4
        with:
          name: corretto-21-lilliput-${{ steps.prepare_artifact.outputs.JAVA_VERSION_EXTRACTED }}-windows-x64-jdk
          path: staging_artifact/
```