github: optimize CI

- Pass filter:tree=0 to reduce download size
- Initialize and use ccache
- Run CI on PRs and on 'arduino' branch pushes only

Author: pillo79

Diff for: .github/workflows/build.yml

@@ -1,24 +1,28 @@
-name: Build
+name: Build native Zephyr samples
 
 on: [push, pull_request]
 
 jobs:
   build:
+    name: Build native Zephyr samples
     runs-on: ubuntu-latest
     container: zephyrprojectrtos/ci:latest
     env:
       CMAKE_PREFIX_PATH: /opt/toolchains
-      PR_NUMBER: ${{ github.event.number }}
+      CCACHE_IGNOREOPTIONS: -specs=*
+      REPOSITORY: ${{ github.event.pull_request.head.repo.full_name || github.repository }}
+      BRANCH: ${{ github.event.pull_request.head.ref || github.ref_name }}
     steps:
       - name: Initialize
         run: |
           mkdir build && cd build
-          west init -m https://github.com/${{ github.repository }}
-          cd modules/lib/ArduinoCore-zephyr/
-          git fetch origin ${{ github.ref }}
-          git checkout FETCH_HEAD
-          cd -
-          west update
+          west init -m https://github.com/${{ env.REPOSITORY }} --mr ${{ env.BRANCH }}
+          west update -o=--filter=tree:0
+
+      - name: ccache
+        uses: hendrikmuhs/[email protected]
+        with:
+          verbose: 1
 
       - name: Build fade
         working-directory: build
@@ -33,4 +37,4 @@ jobs:
       - name: Build adc
         working-directory: build
         run: |
-          west build -p -b arduino_nano_33_ble/nrf52840/sense modules/lib/ArduinoCore-zephyr/samples/analog_input
+          west build -p -b arduino_nano_33_ble/nrf52840/sense modules/lib/ArduinoCore-zephyr/samples/analog_input

Diff for: .github/workflows/package_core.yml

@@ -1,35 +1,59 @@
-name: Package core
+name: Package, test and upload core
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - arduino
+  pull_request:
 
 jobs:
-  build:
+
+  package-core:
+    name: Build and package core
     runs-on: ubuntu-latest
     env:
       ZEPHYR_SDK_INSTALL_DIR: /opt/zephyr-sdk-0.16.8
+      CCACHE_IGNOREOPTIONS: -specs=*
     steps:
       - name: Install toolchain
         working-directory: /opt
         run: |
           sudo apt-get update
-          sudo apt-get install -y --no-install-recommends git cmake wget python3-pip ninja-build
-          wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.16.8/zephyr-sdk-0.16.8_linux-x86_64_minimal.tar.xz
+          sudo apt-get install -y --no-install-recommends git cmake wget python3-pip ninja-build ccache
+          wget -nv https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.16.8/zephyr-sdk-0.16.8_linux-x86_64_minimal.tar.xz
           tar xf zephyr-sdk-0.16.8_linux-x86_64_minimal.tar.xz && cd zephyr-sdk-0.16.8 && ./setup.sh -t arm-zephyr-eabi -c
 
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          persist-credentials: false
 
       - name: Initialize
         run: |
-          ./extra/bootstrap.sh
-          ./extra/build_all.sh
-          ./extra/package.sh `git describe --always`
-          mv ../arduino-core-zephyr-llext* .
+          ./extra/bootstrap.sh -o=--filter=tree:0
+          echo "CORE_TAG=$(git describe --always)" >> "$GITHUB_ENV"
+          echo "CORE_ARTIFACT=ArduinoCore-zephyr-$(git describe --always)" >> "$GITHUB_ENV"
+          echo "BOARD_NAMES=[ $(cat boards.txt | grep '^[^#]*\.build\.variant' | cut -d '.' -f 1 | xargs printf '"%s",' | sed -e 's/,$//') ]" >> "$GITHUB_ENV"
+
+      - name: ccache
+        uses: hendrikmuhs/[email protected]
+        with:
+          verbose: 1
+
+      - name: Build variants
+        run: |
+          ./extra/build_all.sh -f
+
+      - name: Package
+        run: |
+          ./extra/package.sh ${{ env.CORE_TAG }}
+          mv ../${{ env.CORE_ARTIFACT }}.tar.bz2 .
 
       - name: Archive core
         uses: actions/upload-artifact@v4
         with:
-          name: Core
-          path: arduino-core-zephyr-llext*
+          name: ${{ env.CORE_ARTIFACT }}
+          path: ${{ env.CORE_ARTIFACT }}.tar.bz2
 
       - name: Create Blink sketch
         run: |

Diff for: extra/bootstrap.sh

@@ -9,7 +9,7 @@ python3 -m venv venv
 source venv/bin/activate
 pip install west
 west init -l .
-west update
+west update "$@"
 west zephyr-export
 pip install -r ../zephyr/scripts/requirements-base.txt
 # download slim toolchain from https://github.com/zephyrproject-rtos/sdk-ng/releases/tag/v0.16.8

Diff for: extra/package.sh

@@ -10,4 +10,4 @@ FOLDER=`basename $PWD`
 VERSION=$1
 
 cd ..
-tar  --exclude=extras/** --exclude=.git* --exclude=build --exclude=venv --exclude=samples -cjhf arduino-core-zephyr-llext-${VERSION}.tar.bz2 $FOLDER
+tar  --exclude=extras/** --exclude=.git* --exclude=build --exclude=venv --exclude=samples -cjhf ArduinoCore-zephyr-${VERSION}.tar.bz2 $FOLDER