fix: remove stale .github/workflows/ci.yml to stop double CI trigger

Forgejo reads workflows from both .forgejo/workflows/ and .github/workflows/.
With ci.yml in both directories every push triggered the CI workflow twice.
The .github one was an older approach (sharedinbox-runner + flutter-action);
all current CI/CD lives in .forgejo/workflows/ via Dagger + task.

Closes #391

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -1,250 +0,0 @@
-name: CI
-
-on:
-  push:
-    branches: [main]
-  pull_request:
-
-jobs:
-  analyze-and-test:
-    name: Analyze & unit test
-    runs-on: sharedinbox-runner
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: subosito/flutter-action@v2
-        with:
-          flutter-version: "3.41.6"
-          channel: stable
-          cache: true
-
-      - name: Install dependencies
-        run: flutter pub get
-
-      - name: Generate Drift code
-        run: flutter pub run build_runner build --delete-conflicting-outputs
-
-      - name: Check formatting
-        run: dart format --set-exit-if-changed .
-
-      - name: Analyze
-        run: flutter analyze --fatal-infos
-
-      - name: Unit + widget tests with coverage
-        run: flutter test test/unit/ test/widget/ --coverage
-
-      - name: Coverage gate
-        run: dart run scripts/check_coverage.dart
-
-  integration:
-    name: Integration tests (Stalwart)
-    runs-on: sharedinbox-runner
-    # Run integration tests only on push to main, not on every PR.
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: DeterminateSystems/nix-installer-action@v14
-
-      - uses: DeterminateSystems/magic-nix-cache-action@v8
-
-      - name: Cache FVM Flutter SDK
-        uses: actions/cache@v4
-        with:
-          path: ~/.fvm
-          key: fvm-${{ hashFiles('.fvm/fvm_config.json') }}
-
-      - name: Cache pub packages
-        uses: actions/cache@v4
-        with:
-          path: ~/.pub-cache
-          key: pub-${{ hashFiles('pubspec.lock') }}
-          restore-keys: pub-
-
-      - name: Run integration tests
-        run: |
-          nix develop --command bash -c "
-            fvm install --skip-pub-get &&
-            fvm flutter pub get &&
-            fvm flutter pub run build_runner build --delete-conflicting-outputs &&
-            stalwart-dev/test.sh
-          "
-
-  integration-ui:
-    name: UI Integration tests (Stalwart + Xvfb)
-    runs-on: sharedinbox-runner
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - uses: DeterminateSystems/nix-installer-action@v14
-
-      - uses: DeterminateSystems/magic-nix-cache-action@v8
-
-      - name: Install Flutter Linux build dependencies
-        run: |
-          sudo apt-get update -q
-          sudo apt-get install -y --no-install-recommends \
-            libgtk-3-dev pkg-config cmake ninja-build clang \
-            libsecret-1-dev
-
-      - name: Cache FVM Flutter SDK
-        uses: actions/cache@v4
-        with:
-          path: ~/.fvm
-          key: fvm-${{ hashFiles('.fvm/fvm_config.json') }}
-
-      - name: Cache pub packages
-        uses: actions/cache@v4
-        with:
-          path: ~/.pub-cache
-          key: pub-${{ hashFiles('pubspec.lock') }}
-          restore-keys: pub-
-
-      - name: Cache Linux debug build
-        uses: actions/cache@v4
-        with:
-          path: |
-            build/linux
-            .dart_tool/flutter_build
-          key: linux-debug-${{ hashFiles('pubspec.lock', 'lib/**/*.dart', 'integration_test/**/*.dart') }}
-          restore-keys: linux-debug-
-
-      - name: Run UI integration tests
-        run: |
-          nix develop --command bash -c "
-            fvm install --skip-pub-get &&
-            fvm flutter pub get &&
-            fvm flutter pub run build_runner build --delete-conflicting-outputs &&
-            stalwart-dev/integration_ui_test.sh
-          "
-
-  build-linux:
-    name: Build Linux desktop
-    runs-on: sharedinbox-runner
-    needs: analyze-and-test
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install GTK3, build tools and libsecret
-        run: |
-          sudo apt-get update -q
-          sudo apt-get install -y --no-install-recommends \
-            libgtk-3-dev pkg-config cmake ninja-build clang \
-            libsecret-1-dev
-
-      - uses: subosito/flutter-action@v2
-        with:
-          flutter-version: "3.41.6"
-          channel: stable
-          cache: true
-
-      - name: Install dependencies
-        run: flutter pub get
-
-      - name: Generate Drift code
-        run: flutter pub run build_runner build --delete-conflicting-outputs
-
-      - name: Build Linux release
-        run: flutter build linux --release
-
-  deploy:
-    name: Deploy Linux build & publish website
-    runs-on: sharedinbox-runner
-    needs: build-linux
-    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
-    env:
-      SSH_HOST: ${{ secrets.SSH_HOST }}
-      SSH_USER: ${{ secrets.SSH_USER }}
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - name: Install build & deploy dependencies
-        run: |
-          sudo apt-get update -q
-          sudo apt-get install -y --no-install-recommends \
-            libgtk-3-dev pkg-config cmake ninja-build clang \
-            libsecret-1-dev hugo rsync
-
-      - uses: subosito/flutter-action@v2
-        with:
-          flutter-version: "3.41.6"
-          channel: stable
-          cache: true
-
-      - name: Cache pub packages
-        uses: actions/cache@v4
-        with:
-          path: ~/.pub-cache
-          key: pub-${{ hashFiles('pubspec.lock') }}
-          restore-keys: pub-
-
-      - name: Install dependencies
-        run: flutter pub get
-
-      - name: Generate Drift code
-        run: flutter pub run build_runner build --delete-conflicting-outputs
-
-      - name: Generate changelog
-        run: |
-          mkdir -p assets
-          git log -n 50 \
-            --pretty=format:'* %ad [%h](https://codeberg.org/guettli/sharedinbox/commit/%H): %s' \
-            --date=short > assets/changelog.txt
-
-      - name: Setup SSH
-        run: |
-          mkdir -p ~/.ssh
-          printf '%s\n' "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_ed25519
-          chmod 600 ~/.ssh/id_ed25519
-          printf '%s\n' "${{ secrets.SSH_KNOWN_HOSTS }}" >> ~/.ssh/known_hosts
-          chmod 644 ~/.ssh/known_hosts
-
-      - name: Build Linux release
-        run: |
-          HASH=$(git rev-parse --short HEAD)
-          flutter build linux --release --no-pub --dart-define=GIT_HASH=$HASH
-
-      - name: Deploy Linux build to server
-        run: |
-          HASH=$(git rev-parse --short HEAD)
-          DATE_PATH=$(date -u +%Y/%m/%d)
-          REMOTE_DIR="public_html/builds/$DATE_PATH"
-          TARBALL="sharedinbox-linux-amd64-$HASH.tar.gz"
-          tar -czf /tmp/$TARBALL -C build/linux/x64/release bundle
-          ssh "$SSH_USER@$SSH_HOST" "mkdir -p $REMOTE_DIR"
-          scp /tmp/$TARBALL "$SSH_USER@$SSH_HOST:$REMOTE_DIR/$TARBALL"
-          DOWNLOAD_URL="https://sharedinbox.de/builds/$DATE_PATH/$TARBALL"
-          EXISTING=$(ssh "$SSH_USER@$SSH_HOST" \
-            "cat public_html/latest.json 2>/dev/null || echo '{}'")
-          WINDOWS_URL=$(echo "$EXISTING" | \
-            python3 -c "import json,sys; d=json.load(sys.stdin); print(d.get('windows',''))" \
-            2>/dev/null || true)
-          if [ -n "$WINDOWS_URL" ]; then
-            echo "{\"version\":\"$HASH\",\"linux\":\"$DOWNLOAD_URL\",\"windows\":\"$WINDOWS_URL\"}" | \
-              ssh "$SSH_USER@$SSH_HOST" "cat > public_html/latest.json"
-          else
-            echo "{\"version\":\"$HASH\",\"linux\":\"$DOWNLOAD_URL\"}" | \
-              ssh "$SSH_USER@$SSH_HOST" "cat > public_html/latest.json"
-          fi
-
-      - name: Generate build history pages
-        run: python3 scripts/generate_build_history.py
-
-      - name: Build website
-        env:
-          HUGO_PARAMS_GITVERSION: ${{ github.sha }}
-        run: hugo --source website --minify
-
-      - name: Deploy website
-        run: |
-          rsync -avz --delete \
-            --exclude='*.apk' \
-            --exclude='*.tar.gz' \
-            website/public/ \
-            "$SSH_USER@$SSH_HOST:public_html/"