Fix broken main build

.github/workflows/ctest_pipeline.yml

@@ -57,7 +57,15 @@ jobs:
         sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
         sudo apt-get install -y gcc-11 g++-11 clang-14 libclang-cpp14-dev libclang-14-dev ninja-build
         sudo apt-get install curl zip unzip tar pkg-config python3.10-venv flex bison git
+
+    - name: Set SHA to fetch
+      run: echo "SHA=${{github.event.pull_request.head.sha}}" >> $GITHUB_ENV
+      if: ${{ github.event_name == 'pull_request'}}
 
+    - name: Set SHA to fetch
+      run: echo "SHA=${{github.sha}}" >> $GITHUB_ENV
+      if: ${{ github.event_name == 'push'}}
+
     - name: Create CMakeLists.txt
       run: |
         cat <<EOF > CMakeLists.txt
@@ -68,7 +76,7 @@ jobs:
         FetchContent_Declare(
             tsmp
             GIT_REPOSITORY https://github.com/fabian-jung/tsmp.git
-            GIT_TAG $GITHUB_HEAD_REF
+            GIT_TAG ${SHA}
         )
         FetchContent_Declare(
             catch2
@@ -86,6 +94,9 @@ jobs:
         catch_discover_tests(main)
         EOF
 
+    - name: Cat CMakeLists.txt
+      run: cat CMakeLists.txt
+
     - name: Create Test
       run: |
         cat <<EOF > main.cpp