[libc++] Adjust the workflow file for building a Docker image

Author: ldionne

.github/workflows/libcxx-build-containers.yml

@@ -35,9 +35,9 @@ jobs:
 
     - name: Build the Linux builder image and the Android builder image
       working-directory: libcxx/utils/ci
-      run:
-        - docker compose build actions-builder
-        - docker compose build android-buildkite-builder
+      run: |
+        docker compose build actions-builder
+        docker compose build android-buildkite-builder
 
     - name: Log in to GitHub Container Registry
       uses: docker/login-action@v3
@@ -49,15 +49,15 @@ jobs:
     - name: Push the Linux builder image
       if: github.event_name == 'push'
       working-directory: libcxx/utils/ci
-      run:
-        - docker compose push actions-builder
+      run: |
+        docker compose push actions-builder
       env:
         TAG: libcxx-linux-builder:${{ github.sha }}
 
     - name: Push the Android builder image
       if: github.event_name == 'push'
       working-directory: libcxx/utils/ci
-      run:
-        - docker compose push android-buildkite-builder
+      run: |
+        docker compose push android-buildkite-builder
       env:
         TAG: libcxx-android-builder:${{ github.sha }}