debug output for Windows dockcross builds; fixing string concatenation bugs in CI

Author: ianbotsf

.github/scripts/run-container-test.py

@@ -99,11 +99,11 @@ def create_docker_image(opts, oci_exe, base_image_name, packages):
         cmd = [
             "RUN yum -y install",
             *packages,
-        ].join(" ")
-        lines.append(cmd)
+        ]
+        lines.append(' '.join(cmd))
 
     # Compile the contents
-    content = lines.join('\n')
+    content = '\n'.join(lines) + '\n'
 
     # Write the Dockerfile
     with open("Dockerfile", "w") as f:

.github/workflows/ci.yaml

@@ -139,8 +139,12 @@ jobs:
       - name: Setup build environment
         uses: ./.github/actions/setup-build
       - name: Configure Docker Images
+        shell: powershell
         run: |
+          echo "Building Docker images"
           ./docker-images/build-all.sh
+          echo "Built images:"
+          ls -alsh dockcross-*
       - name: Build and Test ${{ env.PACKAGE_NAME }}
         run: |
           ./gradlew build