Fix workflow run for windows build (#7)

Reviewed-on: #7
Co-authored-by: Artur Glavic <artur.glavic@psi.ch>
Co-committed-by: Artur Glavic <artur.glavic@psi.ch>

.github/workflows/release.yml

@@ -23,7 +23,6 @@ on:
 
 jobs:
   test:
-
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -118,12 +117,42 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: 3.12
-    - name: Install dependencies
+    - name: Ensure build environment
+      shell: powershell
       run: |
-        C:\Miniconda\condabin\conda.bat env update --file conda_windows.yml --name base
-        C:\Miniconda\condabin\conda.bat init powershell
+        $envName="eos_build"
+        $envFile="conda_windows.yml"
+        $hashFile="$env:TEMP\$envName.hash"
+
+        $newHash = (Get-FileHash $envFile).Hash
+
+        if (!(Test-Path $hashFile)) {
+            $rebuild = $true
+        } else {
+            $oldHash = Get-Content $hashFile
+            $rebuild = $oldHash -ne $newHash
+        }
+
+        if ($rebuild) {
+            Write-Host "Environment changed → rebuilding"
+            if (micromamba env list | Select-String $envName) {
+                micromamba env remove -n $envName -y 2>$null
+            }
+            micromamba create -n $envName -f $envFile -y
+            $newHash | Out-File $hashFile
+        } else {
+            Write-Host "Environment unchanged → using cached env"
+        }
+    - name: Determine release tag
+      shell: powershell
+      run: |
+        $tag = micromamba run -n eos_build python -c "import eos; print('v'+eos.__version__)"
+        $tag = $tag.Trim()
+        "RELEASE_TAG=$tag" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
     - name: Build with pyinstaller
+      shell: powershell
       run: |
+        micromamba activate eos_build
         pyinstaller windows_build.spec
         cd dist\eos
         Compress-Archive -Path .\* -Destination ..\..\eos.zip