only sample a few builds for CI runs

.github/workflows/main_matrix.yml

@@ -20,7 +20,33 @@ on:
   workflow_dispatch:
 
 jobs:
+  setup-quick:
+    if: ${{ github.event_name != 'workflow_dispatch' }}
+    strategy:
+      fail-fast: false
+      matrix:
+        arch: [esp32, esp32s3, esp32c3, nrf52840, rp2040, stm32, check]
+    runs-on: ubuntu-latest
+    steps:
+      - id: checkout
+        uses: actions/checkout@v4
+        name: Checkout base
+      - id: jsonStep
+        run: |
+          TARGETS=$(./bin/generate_ci_matrix.py ${{matrix.arch}} quick)
+          echo "$TARGETS"
+          echo "${{matrix.arch}}=$(jq -cn --argjson environments "$TARGETS" '{board: $environments}')" >> $GITHUB_OUTPUT
+    outputs:
+      esp32: ${{ steps.jsonStep.outputs.esp32 }}
+      esp32s3: ${{ steps.jsonStep.outputs.esp32s3 }}
+      esp32c3: ${{ steps.jsonStep.outputs.esp32c3 }}
+      nrf52840: ${{ steps.jsonStep.outputs.nrf52840 }}
+      rp2040: ${{ steps.jsonStep.outputs.rp2040 }}
+      stm32: ${{ steps.jsonStep.outputs.stm32 }}
+      check: ${{ steps.jsonStep.outputs.check }}
+
   setup:
+    if: ${{ github.event_name == 'workflow_dispatch' }}
     strategy:
       fail-fast: false
       matrix: