Optimize CI workflow syntax

Write cleaner and more maintainable CI/CD workflows by following established syntax patterns and best practices. Use GitHub Actions’ built-in features like working-directory instead of manual directory changes, employ proper shell quoting and efficient commands, and prefer single-line commands when appropriate.

Key practices:

• Use working-directory parameter instead of cd commands in run steps
• Apply proper shell quoting ("$variable") and use efficient command alternatives (tar -xz -C instead of --directory=)
• Use safe directory creation with mkdir -p to handle existing directories gracefully
• Simplify single-line environment variable assignments instead of multi-line run blocks

Example improvements:

# Instead of:
- name: Build WASM Library
  run: |
    cd lib/binding_web
    npm ci
    npm run build:debug

# Use:
- name: Build WASM Library
  working-directory: lib/binding_web
  run: npm ci && npm run build:debug

# Instead of:
- run: |
    echo "DOCKER_CMD=docker run --rm -v /home/runner:/home/runner -w . $CROSS_IMAGE" >> $GITHUB_ENV

# Use:
- run: echo "DOCKER_CMD=docker run --rm -v /home/runner:/home/runner -w . $CROSS_IMAGE" >> $GITHUB_ENV

These optimizations improve readability, reduce potential errors, and make workflows more maintainable while following GitHub Actions conventions.