github/workflows: Use build matrix for esp32 port.

Allows splitting the esp32 job into multiple parts without too much
boilerplate.  The matrix is parameterised using the name of the function to
call in tools/ci.sh, to minimise the dependency on GitHub Actions.

This can get esp32 build times down around 3m if IDF is cached already.

If the cache is cold, the cache preparation step on each job can double up
against each other.  However, restructuring the workflow to not do this
seems either complex or requires copy-pasting the entire cache step.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

.github/workflows/ports_esp32.yml

@@ -18,7 +18,13 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  build_idf50:
+  build_idf:
+    strategy:
+      fail-fast: false
+      matrix:
+        ci_func:  # names are functions in ci.sh
+          - esp32_build_cmod_s2
+          - esp32_build_s3_c3
     runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v4
@@ -42,5 +48,5 @@ jobs:
       if: steps.cache_esp_idf.outputs.cache-hit != 'true'
       run: source tools/ci.sh && ci_esp32_idf_setup
 
-    - name: Build
-      run: source tools/ci.sh && ci_esp32_build
+    - name: Build ci_${{matrix.ci_func }}
+      run: source tools/ci.sh && ci_${{ matrix.ci_func }}

tools/ci.sh

@@ -130,19 +130,30 @@ function ci_esp32_idf_setup {
     ./esp-idf/install.sh
 }
 
-function ci_esp32_build {
+function ci_esp32_build_common {
     source esp-idf/export.sh
     make ${MAKEOPTS} -C mpy-cross
     make ${MAKEOPTS} -C ports/esp32 submodules
+}
+
+function ci_esp32_build_cmod_s2 {
+    ci_esp32_build_common
+
     make ${MAKEOPTS} -C ports/esp32 \
         USER_C_MODULES=../../../examples/usercmodule/micropython.cmake \
         FROZEN_MANIFEST=$(pwd)/ports/esp32/boards/manifest_test.py
-    make ${MAKEOPTS} -C ports/esp32 BOARD=ESP32_GENERIC_C3
-    make ${MAKEOPTS} -C ports/esp32 BOARD=ESP32_GENERIC_S2
-    make ${MAKEOPTS} -C ports/esp32 BOARD=ESP32_GENERIC_S3
 
     # Test building native .mpy with xtensawin architecture.
     ci_native_mpy_modules_build xtensawin
+
+    make ${MAKEOPTS} -C ports/esp32 BOARD=ESP32_GENERIC_S2
+}
+
+function ci_esp32_build_s3_c3 {
+    ci_esp32_build_common
+
+    make ${MAKEOPTS} -C ports/esp32 BOARD=ESP32_GENERIC_S3
+    make ${MAKEOPTS} -C ports/esp32 BOARD=ESP32_GENERIC_C3
 }
 
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