Use python -m for package verification instead of hardcoded paths

- Replace hardcoded /opt/esp/python_env/.../pytest with python3 -m pytest
- Replace hardcoded /opt/esp/python_env/.../gcovr with python3 -m gcovr
- More portable and follows Python best practices
- Install still uses direct pip path to avoid QEMU emulation issues

Author: hacker-cb

images/esp-idf/Dockerfile

@@ -91,13 +91,14 @@ RUN /opt/esp/python_env/idf5.4_py3.12_env/bin/pip install --no-cache-dir \
 WORKDIR /workspace
 
 # Verify installation
+# Use python -m to run installed packages (more portable than hardcoded paths)
 ARG ESP_IDF_VERSION
 RUN python3 --version && \
-    /opt/esp/python_env/idf5.4_py3.12_env/bin/pytest --version && \
+    python3 -m pytest --version && \
     jq --version && \
     qemu-system-xtensa --version && \
     qemu-system-riscv32 --version && \
-    /opt/esp/python_env/idf5.4_py3.12_env/bin/gcovr --version && \
+    python3 -m gcovr --version && \
     ccache --version && \
     echo "ESP-IDF ${ESP_IDF_VERSION} installation verified successfully"