v1(ci): replace Appveyor with Github Action

.fvmrc

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+{
+  "flutter": "3.35.1"
+}

.github/scripts/update_build_version.sh

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+#!/usr/bin/env bash
+set -e
+
+# ------------------------------------------------------------------------------
+# This script determines the version numbers used in builds and releases.
+#
+# It sets three environment variables:
+#   - PKG_VER   → The package version (semantic version).
+#   - BUILD_VER → The build identifier (may include build number).
+#   - PYPI_VER  → A PyPI-compatible version string for publishing.
+#
+# Behavior:
+#   - On a tagged commit (e.g. "v1.2.3"), it uses that tag as the version.
+#   - On an untagged commit, it generates a "next dev version" by:
+#       • Taking the latest tag (default v0.0.0 if none).
+#       • Incrementing the minor version.
+#       • Appending "+<run number>".
+#   - PYPI_VER is derived from BUILD_VER by replacing "+" with ".dev".
+#
+# This ensures that:
+#   - Release builds (tags) get clean versions like "1.2.3".
+#   - Development builds get versions like "1.3.0+45" (PyPI: "1.3.0.dev45").
+# ------------------------------------------------------------------------------
+
+if [[ "$GITHUB_REF" == refs/tags/* ]]; then
+    # -------------------------------------------------------------
+    # Case 1: This build is triggered by a Git tag
+    # -------------------------------------------------------------
+    # Extract the tag name (strip "refs/tags/")
+    tag="${GITHUB_REF#refs/tags/}"
+    # Remove leading "v" if present (e.g. "v1.2.3" → "1.2.3")
+    export PKG_VER="${tag#v}"
+    # For tagged releases, BUILD_VER is the same as PKG_VER
+    export BUILD_VER="$PKG_VER"
+else
+    # -------------------------------------------------------------
+    # Case 2: This is not a tagged build (e.g. main branch commit)
+    # -------------------------------------------------------------
+    # Get the latest tag, or fall back to "v0.0.0" if none exist
+    cv=$(git describe --abbrev=0 2>/dev/null || echo "v0.0.0")
+    # Remove leading "v" if present
+    cv=${cv#v}
+
+    # Split into major/minor components
+    major=$(echo "$cv" | cut -d. -f1)
+    minor=$(echo "$cv" | cut -d. -f2)
+
+    # Increment the minor version (e.g. "1.2" → "1.3")
+    minor=$((minor + 1))
+
+    # Construct the package version: <major>.<minor>.0
+    export PKG_VER="${major}.${minor}.0"
+
+    # Append the GitHub Actions run number for uniqueness
+    export BUILD_VER="${PKG_VER}+$((GITHUB_RUN_NUMBER + 500))"
+fi
+
+# -------------------------------------------------------------
+# Derive PyPI-compatible version
+# PyPI does not accept "+" in versions, so replace with ".dev"
+# Example: "1.3.0+45" → "1.3.0.dev45"
+# -------------------------------------------------------------
+export PYPI_VER="${BUILD_VER/+/.dev}"
+
+# Print values for debugging in logs
+echo "PKG_VER=$PKG_VER"
+echo "BUILD_VER=$BUILD_VER"
+echo "PYPI_VER=$PYPI_VER"
+
+# Export values as environment variables
+echo "PKG_VER=$PKG_VER" >> $GITHUB_ENV
+echo "BUILD_VER=$BUILD_VER" >> $GITHUB_ENV
+echo "PYPI_VER=$PYPI_VER" >> $GITHUB_ENV

.github/workflows/release.yml

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+name: Build & Publish
+
+on:
+  push:
+    branches:
+      - '**'   # match all branches
+    tags:
+      - '*'    # match all tags
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  id-token: write
+  contents: read
+
+jobs:
+  build:
+    name: Publish flet-audio-recorder package
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0   # fetch all history
+          fetch-tags: true # ensure tags are available
+
+      - name: Setup uv
+        uses: astral-sh/setup-uv@v6
+
+      - name: Patch versions
+        run: |
+          source .github/scripts/update_build_version.sh
+          uv version $PYPI_VER
+          uv run .github/scripts/patch_pubspec_version.py src/flutter/*/pubspec.yaml $PKG_VER
+
+      - name: Setup Flutter
+        uses: kuhnroyal/flutter-fvm-config-action/setup@v3
+        with:
+          path: '.fvmrc'
+          cache: true
+
+      - name: Analyze Flutter package
+        run: |
+          cd src/flutter/*
+          dart pub get
+          dart analyze
+          cd -
+
+      - name: Build Python package
+        run: uv build
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist/*.whl
+
+      - name: Publish Python package
+        if: github.event_name != 'pull_request' && (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/'))
+        run: uv publish