github/workflows: Build all example .py files as part of CI.

Signed-off-by: Damien George <damien@micropython.org>

.github/workflows/build_packages.yml

@@ -17,6 +17,8 @@ jobs:
       run: source tools/ci.sh && ci_build_packages_check_manifest
     - name: Compile package index
       run: source tools/ci.sh && ci_build_packages_compile_index
+    - name: Compile package examples
+      run: source tools/ci.sh && ci_build_packages_examples
     - name: Publish packages for branch
       if: vars.MICROPY_PUBLISH_MIP_INDEX && github.event_name == 'push' && ! github.event.deleted
       run: source tools/ci.sh && ci_push_package_index

tools/ci.sh

@@ -41,6 +41,12 @@ function ci_build_packages_compile_index {
     python3 tools/build.py --micropython /tmp/micropython --output $PACKAGE_INDEX_PATH
 }
 
+function ci_build_packages_examples {
+    for example in $(find -path \*example\*.py); do
+        /tmp/micropython/mpy-cross/build/mpy-cross $example
+    done
+}
+
 function ci_push_package_index {
     set -euo pipefail