attempt #382 to get conditional steps working

.github/workflows/build-and-test.yml

@@ -30,11 +30,9 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: install 32-bit
-        if: ${{ matrix.bits }} == '32'
-        run: |
-          sudo apt update
-          sudo apt -y install g++-multilib libc6:i386
+      - if: matrix.bits == '32'
+        name: install 32-bit
+        run: sudo apt -y install g++-multilib libc6-i386
 
       - name: create build environment
         run: cmake -E make_directory ${{ runner.workspace }}/_build
@@ -85,8 +83,8 @@ jobs:
           sudo apt update
           sudo apt -y install clang-3.6 cmake3 g++-4.8 git
 
-      - name: install other bits
-        if: ${{ matrix.compiler }} == g++-6
+      - if: matrix.compiler == g++-6
+        name: install other bits
         run: |
           sudo apt -y install software-properties-common
           sudo add-apt-repository -y "ppa:ubuntu-toolchain-r/test"