Add GitHub actions for CI/CD

.github/workflows/main.yaml

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+name: Main Branch CI
+
+# Declare default permissions as read only.
+permissions: read-all
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main, ffi-wrapper-core-pkg]
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * *" # Every day at midnight
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  flutter-tests:
+    name: Test mediapipe_core against ${{ matrix.flutter_version }}
+    runs-on: ${{ matrix.os }}
+    # Skip running job on forks
+    if: github.repository == 'google/flutter-mediapipe'
+    strategy:
+      fail-fast: false
+      matrix:
+        flutter_version: [stable, beta, master]
+        # TODO(craiglabenz): Add `ubuntu-latest` and `windows-latest` when those artifacts exist
+        os: [macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: ${{ matrix.flutter_version }}
+      - run: ./tool/mediapipe_ci_script_${{ matrix.flutter_version }}.sh

tool/ci_script_shared.sh

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+function ci_package () {
+    local channel="$1"
+
+    shift
+    local arr=("$@")
+    for PACKAGE_NAME in "${arr[@]}"
+    do
+        echo "== Testing '${PACKAGE_NAME}' on Flutter's $channel channel =="
+        pushd "packages/${PACKAGE_NAME}"
+
+        # Grab packages.
+        flutter pub get
+
+        # Run the analyzer to find any static analysis issues.
+        dart analyze --fatal-infos
+
+        # Run the formatter on all the dart files to make sure everything's linted.
+        dart format --output none --set-exit-if-changed .
+
+        # Run the actual tests.
+        if [ -d "test" ]
+        then
+            flutter test
+        fi
+
+        popd
+    done
+}

tool/mediapipe_ci_script_beta.sh

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+#!/bin/bash
+
+set -e
+
+DIR="${BASH_SOURCE%/*}"
+source "$DIR/ci_script_shared.sh"
+
+flutter doctor -v
+
+declare -ar PACKAGE_NAMES=(
+    "mediapipe-core"
+)
+
+ci_package "beta" "${PACKAGE_NAMES[@]}"
+
+echo "-- Success --"

tool/mediapipe_ci_script_master.sh

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+#!/bin/bash
+
+set -e
+
+DIR="${BASH_SOURCE%/*}"
+source "$DIR/ci_script_shared.sh"
+
+flutter doctor -v
+
+declare -ar PACKAGE_NAMES=(
+    "mediapipe-core"
+)
+
+ci_package "master" "${PACKAGE_NAMES[@]}"
+
+echo "-- Success --"

tool/mediapipe_ci_script_stable.sh

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+#!/bin/bash
+
+set -e
+
+DIR="${BASH_SOURCE%/*}"
+source "$DIR/ci_script_shared.sh"
+
+flutter doctor -v
+
+declare -ar PACKAGE_NAMES=(
+    "mediapipe-core"
+)
+
+ci_package "stable" "${PACKAGE_NAMES[@]}"
+
+echo "-- Success --"