Add CI workflow to publish tester builds

.github/workflows/publish-go-tester-task.yml

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+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/publish-go-tester-task.md
+name: Publish Tester Build
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  create:
+  push:
+    paths:
+      - ".github/workflows/publish-go-tester-task.ya?ml"
+      - "go.mod"
+      - "go.sum"
+      - "Taskfile.ya?ml"
+      - "DistTasks.ya?ml"
+      - "**.go"
+      - "icon/**"
+      - "config.ini"
+      - "manifest.xml"
+  pull_request:
+    paths:
+      - ".github/workflows/publish-go-tester-task.ya?ml"
+      - "go.mod"
+      - "go.sum"
+      - "Taskfile.ya?ml"
+      - "DistTasks.ya?ml"
+      - "**.go"
+      - "icon/**"
+      - "config.ini"
+      - "manifest.xml"
+  workflow_dispatch:
+  repository_dispatch:
+
+env:
+  GO_VERSION: "1.14"
+
+jobs:
+  run-determination:
+    runs-on: ubuntu-latest
+    outputs:
+      result: ${{ steps.determination.outputs.result }}
+    steps:
+      - name: Determine if the rest of the workflow should run
+        id: determination
+        run: |
+          RELEASE_BRANCH_REGEX="refs/heads/[0-9]+.[0-9]+.x"
+          # The `create` event trigger doesn't support `branches` filters, so it's necessary to use Bash instead.
+          if [[ \
+            "${{ github.event_name }}" != "create" || \
+            "${{ github.ref }}" =~ $RELEASE_BRANCH_REGEX \
+          ]]; then
+            # Run the other jobs.
+            RESULT="true"
+          else
+            # There is no need to run the other jobs.
+            RESULT="false"
+          fi
+
+          echo "::set-output name=result::$RESULT"
+
+  #this job is heavily customized because the build is quite a bit different from other tooling team projects
+  build:
+    needs: run-determination
+    if: needs.run-determination.outputs.result == 'true'
+
+    #use the strategy instead because we still use the native build
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, windows-2019, macos-10.15]
+        arch: [-amd64]
+        include:
+        - os: windows-2019
+          arch: -386
+
+    defaults:
+      run:
+        shell: bash
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+
+      - name: Set env vars
+        run: |
+          echo $(go env GOPATH)/bin >> $GITHUB_PATH
+
+      - name: Disable EOL conversions
+        run: git config --global core.autocrlf false
+
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ env.GO_VERSION }}
+
+      # dependencies used for compiling the GUI
+      - name: Install Dependencies (Linux)
+        run: sudo apt update && sudo apt install -y --no-install-recommends build-essential libgtk-3-dev libwebkit2gtk-4.0-dev libappindicator3-dev
+        if: runner.os == 'Linux'
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Build the Agent for linux
+        run: task go:build
+        if: runner.os == 'Linux'
+
+        # build the agent without GUI support (no tray icon)
+      - name: Build the Agent-cli
+        run: task go:build-cli
+        if: runner.os == 'Linux'
+
+        # the manifest is required by windows GUI apps, otherwise the binary will crash with: "Unable to create main window: TTM_ADDTOOL failed" (for reference https://github.com/lxn/walk/issues/28)
+        # rsrc will produce a *.syso file that should get automatically recognized by go build command and linked into an executable.
+      - name: Download tool to embed manifest in win binary
+        run: go get github.com/akavel/rsrc
+        if: runner.os == 'Windows'
+
+        # building the agent for win requires a different task because of an extra flag
+      - name: Build the Agent for win32
+        env:
+          GOARCH: 386  # 32bit architecture (for support)
+          GO386: 387  # support old instruction sets without MMX (used in the Pentium 4) (will be deprecated in GO > 1.15 https://golang.org/doc/go1.15)
+        run: task go:build-win
+        if: runner.os == 'Windows' && matrix.arch == '-386'
+
+      - name: Build the Agent for win64
+        run: task go:build-win # GOARCH=amd64 by default on the runners
+        if: runner.os == 'Windows' && matrix.arch == '-amd64'
+
+      - name: Build the Agent for macos
+        env:
+          MACOSX_DEPLOYMENT_TARGET: 10.11 # minimum supported version for mac
+          CGO_CFLAGS: -mmacosx-version-min=10.11
+          CGO_LDFLAGS: -mmacosx-version-min=10.11
+        run: task go:build
+        if: runner.os == 'macOS'
+
+      # config.ini is required by the executable when it's run
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: arduino-create-agent-${{ matrix.os }}${{ matrix.arch }}
+          path: |
+            arduino-create-agent*
+            config.ini
+          if-no-files-found: error