try with bash ...

Author: mulle-nat

.github/workflows/cmake-errors.yml

@@ -104,6 +104,7 @@ jobs:
           git clone https://github.com/mulle-core/mulle-core.git "${{steps.set-install-dir.outputs.MULLE_CORE_SRC_DIR}}"
           
       - name: Configure, build and install mulle-core with CMake
+        shell: bash
         working-directory: "${{steps.set-install-dir.outputs.MULLE_CORE_SRC_DIR}}"
         run: |
           cmake -B build \
@@ -113,13 +114,13 @@ jobs:
             -DCMAKE_BUILD_TYPE=Release
           cmake --build build --config Release
           cmake --install build --config Release
-        shell: bash
         
       - name: Clone mulle-atinit repository
         run: |
           git clone https://github.com/mulle-core/mulle-atinit.git "${{steps.set-install-dir.outputs.MULLE_ATINIT_SRC_DIR}}"
           
       - name: Configure, build and install mulle-atinit with CMake
+        shell: bash
         working-directory: "${{steps.set-install-dir.outputs.MULLE_ATINIT_SRC_DIR}}"
         run: |
           cmake -B build \
@@ -129,13 +130,13 @@ jobs:
             -DCMAKE_BUILD_TYPE=Release
           cmake --build build --config Release
           cmake --install build --config Release
-        shell: bash
           
       - name: Clone mulle-atexit repository
         run: |
           git clone https://github.com/mulle-core/mulle-atexit.git "${{steps.set-install-dir.outputs.MULLE_ATEXIT_SRC_DIR}}"
           
       - name: Configure, build and install mulle-atexit with CMake
+        shell: bash
         working-directory: "${{steps.set-install-dir.outputs.MULLE_ATEXIT_SRC_DIR}}"
         run: |
           cmake -B build \
@@ -145,14 +146,14 @@ jobs:
             -DCMAKE_BUILD_TYPE=Release
           cmake --build build --config Release
           cmake --install build --config Release
-        shell: bash
           
       - name: Install packages (Windows)
         if: runner.os == 'Windows'
         run: |
           choco install --no-progress ninja ${{ matrix.packages }}
           
       - name: Generate project files
+        shell: bash
         run: |
           cmake ${{ matrix.cmake-args }}  \
                 -S "${{ matrix.src-dir || '.' }}" \
@@ -163,6 +164,6 @@ jobs:
         env:
           CC: ${{ matrix.compiler }}
           CFLAGS: ${{ matrix.cflags }}
-          
+  
       - name: Compile source code
         run: cmake --build "${{ matrix.build-dir || '.' }}" --config "${{ matrix.build-config || 'Release' }}"