Use simple pytest/gcovr commands in verification instead of hardcoded paths

- Replace hardcoded venv paths with simple pytest/gcovr commands
- Activate ESP-IDF environment for verification (works on amd64)
- Cleaner, more maintainable verification step

Author: hacker-cb

images/esp-idf/Dockerfile

@@ -91,16 +91,16 @@ RUN /opt/esp/python_env/idf5.4_py3.12_env/bin/pip install --no-cache-dir \
 WORKDIR /workspace
 
 # Verify installation
-# Use venv python -m to verify packages (packages are installed in venv)
 ARG ESP_IDF_VERSION
-RUN python3 --version && \
-    /opt/esp/python_env/idf5.4_py3.12_env/bin/python3 -m pytest --version && \
+RUN bash -c '. ${IDF_PATH}/export.sh && \
+    python3 --version && \
+    pytest --version && \
     jq --version && \
     qemu-system-xtensa --version && \
     qemu-system-riscv32 --version && \
-    /opt/esp/python_env/idf5.4_py3.12_env/bin/python3 -m gcovr --version && \
+    gcovr --version && \
     ccache --version && \
-    echo "ESP-IDF ${ESP_IDF_VERSION} installation verified successfully"
+    echo "ESP-IDF ${ESP_IDF_VERSION} installation verified successfully"'
 
 CMD ["/bin/bash"]