fix(ci): Force Docker rebuild to bypass cache for environment variable changes

Resolves persistent CI failures in workflow run 17084167265 by forcing
Docker images to rebuild without cache.

Problem:
- Previous fix for ZPMOD_STAGE_MODULE_DIR in docker-compose.yml was correct
- However, GitHub Actions was reusing cached Docker images built before the fix
- Cached images don't pick up docker-compose.yml environment changes
- Tests continued failing with 'zpmod module not found' errors

Solution:
- Add --no-cache flag to 'docker compose build' commands in CI workflow
- Forces fresh Docker image builds that will use updated docker-compose.yml
- Ensures environment variables are properly set in containers

This resolves the Docker caching issue without changing the underlying fix.

Author: ss-o

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Build test environment
         run: |
-          cd docker && docker compose build test-${{ matrix.env }}
+          cd docker && docker compose build --no-cache test-${{ matrix.env }}
 
       - name: Run tests in ${{ matrix.env }} environment
         run: |
@@ -68,7 +68,7 @@ jobs:
       - name: Build and run smoke tests
         run: |
           cd docker
-          docker compose build test-smoke
+          docker compose build --no-cache test-smoke
           docker compose run --rm test-smoke
 
       - name: Upload smoke logs (if any)