Fix linux workflow.

Author: Dandielo

.github/workflows/build-dispatch.yaml

@@ -30,7 +30,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Clang ${{ inputs.clang-version }} (ubuntu-only)
-        if: ${{ inputs.host-platform == 'ubuntu-latest' }}
+        if: ${{ inputs.host-platform == 'ubuntu-latest' && inputs.clang-version != '' }}
         run: |
           wget https://apt.llvm.org/llvm.sh
           chmod +x llvm.sh

.github/workflows/build-validate-linux.yaml

@@ -23,3 +23,4 @@ jobs:
       host-platform: 'ubuntu-latest'
       target-platform: 'linux'
       targets: "${{ matrix.project }}-${{ matrix.pipeline }}-${{ matrix.config }}"
+      clang-version: '20'