ci: add Forgejo-native CI workflow for the Circuit-Forge fork

Ashley's upstream .github/workflows/ci.yml targets GitHub-hosted
ubuntu-latest/windows-latest/macos-latest runners, which aren't
registered on git.opensourcesolarpunk.com for non-org repos - every
matrix job on eva/focus-flow's PR #18 shows "Has been cancelled"
rather than a real pass/fail. This adds a Forgejo-native workflow at
.forgejo/workflows/ci.yml using ubuntu-latest only, matching the
pattern already proven working for circuitforge-core/peregrine/kiwi
on this instance. Also runs the Flutter app's own analyze/test/format,
which the upstream workflow (root dart workspace test.dart only)
never covered.

Closes: Circuit-Forge/focus-flow#9

.forgejo/workflows/ci.yml

@@ -0,0 +1,49 @@
+# SPDX-FileCopyrightText: 2026 FocusFlow contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+
+# Forgejo-native CI for the Circuit-Forge focus-flow fork.
+#
+# Ashley's upstream .github/workflows/ci.yml targets GitHub-hosted
+# ubuntu-latest/windows-latest/macos-latest runners, which don't exist on
+# this self-hosted instance for non-org repos (that workflow shows every
+# matrix job as "Has been cancelled" on eva/focus-flow). This workflow
+# mirrors the working pattern already used by circuitforge-core, peregrine,
+# and kiwi on this instance: ubuntu-latest only.
+
+name: CI
+
+on:
+  push:
+    branches: [main, 'feat/**', 'fix/**']
+  pull_request:
+    branches: [main]
+
+jobs:
+  workspace:
+    name: Pure-Dart workspace packages
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dart-lang/setup-dart@v1
+        with:
+          sdk: stable
+      - run: dart pub get
+      - run: dart analyze
+      - run: dart run scripts/test.dart
+
+  flutter_app:
+    name: Flutter app (analyze, test, format)
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: apps/focus_flow_flutter
+    steps:
+      - uses: actions/checkout@v4
+      - uses: subosito/flutter-action@v2
+        with:
+          flutter-version: 3.44.4
+          channel: stable
+      - run: flutter pub get
+      - run: flutter analyze
+      - run: flutter test
+      - run: dart format --set-exit-if-changed lib test