update-flutter.yml

name: Update Flutter stable version

on:
  schedule:
    - cron: "23 6 * * *"
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  update:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6

      - name: Find latest stable Flutter version
        id: latest
        shell: bash
        run: |
          set -euo pipefail
          latest=$(
            curl --fail --silent https://storage.googleapis.com/flutter_infra_release/releases/releases_linux.json \
              | jq -r '.current_release.stable as $stable | .releases[] | select(.hash == $stable) | .version'
          )
          if [ -z "$latest" ] || [ "$latest" = "null" ]; then
            echo "Could not resolve latest Flutter release" >&2
            exit 1
          fi
          echo "version=$latest" >> "$GITHUB_OUTPUT"

      - name: Update versions.env
        id: update
        shell: bash
        run: |
          set -euo pipefail
          current=$(grep '^FLUTTER_STABLE_VERSION=' versions.env | cut -d= -f2- || true)
          if [ "$current" = "${{ steps.latest.outputs.version }}" ]; then
            echo "changed=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          tmp=$(mktemp)
          awk -F= -v latest="${{ steps.latest.outputs.version }}" \
            'BEGIN { updated=0 } /^FLUTTER_STABLE_VERSION=/ { print "FLUTTER_STABLE_VERSION=" latest; updated=1; next } { print } END { if (!updated) print "FLUTTER_STABLE_VERSION=" latest }' \
            versions.env > "$tmp"
          mv "$tmp" versions.env
          echo "changed=true" >> "$GITHUB_OUTPUT"

      - name: Create pull request
        if: steps.update.outputs.changed == 'true'
        uses: peter-evans/create-pull-request@v8
        with:
          branch: bot/update-flutter-${{ steps.latest.outputs.version }}
          commit-message: "chore: update Flutter to ${{ steps.latest.outputs.version }}"
          title: "chore: update Flutter to ${{ steps.latest.outputs.version }}"
          body: |
            Updates the base image Flutter SDK version to `${{ steps.latest.outputs.version }}`.

            The publish workflow will build and push:
            - `ghcr.io/solvro/flutter-web-only:${{ steps.latest.outputs.version }}`
          labels: dependencies, flutter