Add github action for core release

.github/workflows/release.yaml

+name: release
+
+on:
+  push:
+    tags:
+      - "[0-9]+.[0-9]+.[0-9]+*"
+
+jobs:
+  core-pre-release-from-tag:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Checkout ArduinoCore-API
+        uses: actions/checkout@v2
+        with:
+          repository: arduino/ArduinoCore-API
+          path: extras/ArduinoCore-API
+
+      - name: Check if API should be compiled in the core
+        id: checkapi
+        run: |
+          if [[ $(grep -r api platform.txt) ]]; then echo "::set-output name=IS_API::true"; fi
+
+      - name: Checkout latest tag of ArduinoCore-API and add it to the core
+        run: |
+          cd extras/ArduinoCore-API
+          git fetch --tags
+          git checkout $(git describe --tags $(git rev-list --tags --max-count=1))
+          cd ../..
+          mv "$GITHUB_WORKSPACE/extras/ArduinoCore-API/api" "$GITHUB_WORKSPACE/cores/arduino"
+        if: steps.checkapi.outputs.IS_API == 'true'
+
+      - name: Remove ArduinoCore-API
+        run: rm -r "$GITHUB_WORKSPACE/extras/ArduinoCore-API"
+
+      - name: Set env
+        run: echo "TAG_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Get repo name
+        run: echo "REPOSITORY_NAME=$(echo ${{ github.repository }} | cut -d "/" -f2-)" >> $GITHUB_ENV
+
+      - name: Package the new core
+        run: |
+          extras/pack.release.bash $TAG_VERSION $REPOSITORY_NAME
+          cd extras
+          mkdir staging
+          echo $PWD
+          mv ../*.json staging/
+          mv ../*.tar.bz2 staging/
+          cd ..
+
+      - name: Get architecture name
+        run: |
+          echo "ARCHITECTURE=$(cat extras/package_index.json.NewTag.template | jq ".packages[0].platforms[0].architecture" | sed 's/\"//g')" >> $GITHUB_ENV
+
+      - name: Upload package_*_index.json and *.tar.bz2 file to Arduino downloads servers
+        env:
+            AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+            AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+        run: |
+          aws s3 sync extras/staging/ s3://${{ secrets.ARDUINO_DOWNLOADS_BUCKET }}/packages/staging/ --exclude "*" --include *.json
+          aws s3 sync extras/staging/ s3://${{ secrets.ARDUINO_DOWNLOADS_BUCKET }}/cores/staging/ --exclude "*" --include *.tar.bz2
+
+      - name: Checkout Basic examples
+        uses: actions/checkout@v2
+        with:
+          repository: arduino/arduino-examples
+          path: extras/arduino-examples
+
+      - name: Install Arduino CLI
+        uses: arduino/setup-arduino-cli@v1.1.1
+        with:
+          version: "0.14.0"
+
+      - name: Download and verify new core
+        run: |
+          export PATH=$PATH:$PWD
+          arduino-cli version
+          cp extras/staging/package_${REPOSITORY_NAME}_${TAG_VERSION}_index.json .
+          export ARDUINO_DIRECTORIES_DATA=$PWD
+          export ARDUINO_BOARD_MANAGER_ADDITIONAL_URLS=file://$PWD/package_${REPOSITORY_NAME}_${TAG_VERSION}_index.json
+          arduino-cli config init
+          arduino-cli config dump -v
+          arduino-cli core update-index -v
+          arduino-cli core install arduino:${ARCHITECTURE}@${TAG_VERSION}
+          INDEX=0
+          arduino-cli board listall --format=json > boardlist.json
+          N=$(jq '.boards | length' boardlist.json)
+          let N=N-1
+          echo $N
+          for INDEX in $(seq 0 1 $N); do arduino-cli compile --fqbn $(cat boardlist.json | jq ".boards[$INDEX].FQBN" | sed 's/\"//g') $PWD/extras/arduino-examples/examples/01.Basics/Blink; done
+
+      # See: https://github.com/rtCamp/action-slack-notify
+      - name: Slack notification of core pre-release
+        uses: rtCamp/action-slack-notify@v2.1.0
+        env:
+          SLACK_CHANNEL: core_releases
+          SLACK_COLOR: good
+          SLACK_USERNAME: ArduinoBot
+          SLACK_ICON: https://github.com/arduino.png?size=48
+          SLACK_TITLE: Arduino core pre-release
+          SLACK_MESSAGE: 'Version ${{ env.TAG_VERSION }} of core ${{ env.REPOSITORY_NAME }} is now available'
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+          MSG_MINIMAL: true
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extras/pack.release.bash

 #!/bin/bash -ex
 
-#  pack.*.bash - Bash script to help packaging avr core releases.
+#  pack.*.bash - Bash script to help packaging samd core releases.
 #  Copyright (c) 2015 Arduino LLC.  All right reserved.
 #
 #  This library is free software; you can redistribute it and/or
@@ -17,17 +17,40 @@
 #  License along with this library; if not, write to the Free Software
 #  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
+# Version check removed because version string passed from jenkins was incorrect
+VERSION_FROM_TAG=$1
+CORE_NAME=$2
+echo $VERSION_FROM_TAG
+echo $CORE_NAME
 VERSION=`grep version= platform.txt | sed 's/version=//g'`
+echo $VERSION
+
+if [ $VERSION != $VERSION_FROM_TAG ]; then
+    exit 0
+fi
 
 PWD=`pwd`
 FOLDERNAME=`basename $PWD`
 THIS_SCRIPT_NAME=`basename $0`
+FILENAME=core-$CORE_NAME-$VERSION.tar.bz2
+echo $FILENAME
 
-rm -f avr-$VERSION.tar.bz2
+rm -f *.tar.bz2
+rm -f *.json
 
 cd ..
-tar --transform "s|$FOLDERNAME|$FOLDERNAME-$VERSION|g"  --exclude=extras/** --exclude=.git* --exclude=.idea -cjf avr-$VERSION.tar.bz2 $FOLDERNAME
+tar  --exclude=extras/** --exclude=.git* --exclude=.idea -cjhf $FILENAME $FOLDERNAME
 cd -
 
-mv ../avr-$VERSION.tar.bz2 .
+mv ../$FILENAME .
+
+CHKSUM=`sha256sum $FILENAME | awk '{ print $1 }'`
+SIZE=`wc -c $FILENAME | awk '{ print $1 }'`
 
+cat extras/package_index.json.NewTag.template |
+# sed "s/%%BUILD_NUMBER%%/${BUILD_NUMBER}/" |
+# sed "s/%%CURR_TIME%%/${CURR_TIME_SED}/" |
+sed "s/%%VERSION%%/${VERSION}/" |
+sed "s/%%FILENAME%%/${FILENAME}/" |
+sed "s/%%CHECKSUM%%/${CHKSUM}/" |
+sed "s/%%SIZE%%/${SIZE}/" > package_${CORE_NAME}_${VERSION}_index.json
\ No newline at end of file

extras/package_index.json.NewTag.template

+{
+  "packages": [
+    {
+      "name": "arduino",
+      "maintainer": "Arduino Betatesting",
+      "websiteURL": "http://www.arduino.cc/",
+      "email": "packages@arduino.cc",
+      "help": {
+        "online": "http://www.arduino.cc/en/Reference/HomePage"
+      },
+      "platforms": [
+        {
+          "name": "Arduino megaAVR Boards - Pre-release",
+          "architecture": "megaavr",
+          "version": "%%VERSION%%",
+          "category": "Arduino",
+          "url": "http://downloads.arduino.cc/cores/staging/%%FILENAME%%",
+          "archiveFileName": "%%FILENAME%%",
+          "checksum": "SHA-256:%%CHECKSUM%%",
+          "size": "%%SIZE%%",
+          "help": {
+            "online": "https://github.com/arduino/ArduinoCore-megaavr/issues"
+          },
+          "boards": [
+            {
+              "name": "Arduino Uno WiFi Rev2"
+            },
+            {
+              "name": "Arduino Nano Every"
+            }
+          ],
+          "toolsDependencies": [
+            {
+              "packager": "arduino",
+              "name": "avr-gcc",
+              "version": "7.3.0-atmel3.6.1-arduino5"
+            },
+            {
+              "packager": "arduino",
+              "name": "avrdude",
+              "version": "6.3.0-arduino17"
+            },
+            {
+              "packager": "arduino",
+              "name": "arduinoOTA",
+              "version": "1.3.0"
+            }
+          ]
+        }
+      ],
+      "tools": []
+    }
+  ]
+}
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