[CI/CD] Test environment variables sharing (2)

.github/workflows/build.yml

@@ -38,15 +38,15 @@ jobs:
       - name: Get CMake and Ninja
         uses: lukka/get-cmake@latest
         with:
-          cmakeVersion: ${{ CMAKE_VERSION }}
-          ninjaVersion: ${{ NINJA_VERSION }}
+          cmakeVersion: $CMAKE_VERSION
+          ninjaVersion: $NINJA_VERSION
 
       - name: Install Clang
         run: |
           wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-          sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-${{ COMPILER_VERSION }} main"
+          sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-$COMPILER_VERSION main"
           sudo apt update
-          sudo apt install -y ${{ matrix.compiler.cc }}-${{ COMPILER_VERSION }} libc++-${{ COMPILER_VERSION }}-dev libc++abi-${{ COMPILER_VERSION }}-dev
+          sudo apt install -y ${{ matrix.compiler.cc }}-$COMPILER_VERSION libc++-$COMPILER_VERSION-dev libc++abi-$COMPILER_VERSION-dev
 
       - name: Install dependencies
         run: |
@@ -56,8 +56,8 @@ jobs:
 
       - name: Configure
         env:
-          CC: ${{ matrix.compiler.cc }}-${{ COMPILER_VERSION }}
-          CXX: ${{ matrix.compiler.cxx }}-${{ COMPILER_VERSION }}
+          CC: ${{ matrix.compiler.cc }}-$COMPILER_VERSION
+          CXX: ${{ matrix.compiler.cxx }}-$COMPILER_VERSION
         run: cmake -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} -DFLUX_GRAPHICS_API=OpenGL -B ${{ github.workspace }}/build/${{ matrix.os }}-${{ env.BUILD_TYPE }} -G Ninja
 
       - name: Build