Update build workflow to validate against latest released version

.github/workflows/build.yaml

@@ -4,25 +4,44 @@ on:
       - release
 
 jobs:
-  container-image:
-    name: 'Build container image'
+  extract-version:
+    name: 'Extract version'
     runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v2
+        with: 
+          fetch-depth: 0
       - name: 'Extract turnierplan.NET version'
+        id: extract-version
         shell: pwsh
         run: |
+          $LatestTag = git describe --tags --abbrev=0 --match=[0-9]*.[0-9]*.[0-9]*
           $VersionXmlContent = Get-Content -Path "version.xml" -Raw
           $Version = [regex]::Match($VersionXmlContent, '<Version>(\d+\.\d+\.\d+)</Version>').Groups[1].Value
-          Write-Host $Version
-          Add-Content -Path $env:GITHUB_ENV -Value "TURNIERPLAN_APPLICATION_VERSION=$Version"
+          Write-Host "Last git tag: $LatestTag"
+          Write-Host "Detected version: $Version"
+          if ($Version -eq $LatestTag) {
+            Write-Host "Version equals latest tag, failing workflow!"
+            exit 1
+          }
+          Add-Content -Path $env:GITHUB_OUTPUT -Value "turnierplan_version=$Version"
         working-directory: './src'
+    outputs:
+      turnierplan_version: ${{ steps.extract-version.outputs.turnierplan_version }}
+
+  container-image:
+    name: 'Build container image'
+    runs-on: ubuntu-24.04
+    needs:
+      - extract-version
+    steps:
+      - uses: actions/checkout@v2
       - name: 'Replace environment tokens'
         uses: cschleiden/replace-tokens@v1
         with:
           files: '["**/environment.prod.ts"]'
         env:
-          TOKEN_APPLICATION_VERSION: "${{ env.TURNIERPLAN_APPLICATION_VERSION }}"
+          TOKEN_APPLICATION_VERSION: "${{ needs.extract-version.outputs.turnierplan_version }}"
       - name: Login to Docker Hub
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
         with:
@@ -34,11 +53,13 @@ jobs:
           context: ./src
           file: ./src/Turnierplan.App/Dockerfile
           push: true
-          tags: '${{ vars.DOCKER_HUB_REPOSITORY }}:latest,${{ vars.DOCKER_HUB_REPOSITORY }}:${{ env.TURNIERPLAN_APPLICATION_VERSION }}'
+          tags: '${{ vars.DOCKER_HUB_REPOSITORY }}:latest,${{ vars.DOCKER_HUB_REPOSITORY }}:${{ needs.extract-version.outputs.turnierplan_version }}'
 
   nuget-package:
     name: 'Build NuGet package'
     runs-on: ubuntu-24.04
+    needs:
+      - extract-version
     steps:
       - uses: actions/checkout@v2
       - name: 'Setup .NET SDK 9.x'