fix(ci): replace GitHub-hosted actions with direct SDK downloads

The subosito/flutter-action, actions/setup-java, and actions/setup-python
actions all query GitHub internal APIs that are unavailable on self-hosted
Gitea Actions runners. This caused the Test job to fail on Magrathea (Mac
runner) even though it was labelled [self-hosted, linux].

Changes:
- Replace subosito/flutter-action@v2 with direct Flutter SDK downloads
  from Google's CDN (platform-aware: linux-x64 vs darwin-x64)
- Replace actions/setup-java@v4 with direct Temurin JDK 17 download
- Replace actions/setup-python@v5 with system Python3 (graceful fallback)
- Linux jobs (lint, test) use linux-x64 Flutter
- macOS jobs (build-ios) use darwin-x64 Flutter
- Android build (ubuntu-latest) keeps native action support

.gitea/workflows/ci.yml

@@ -28,10 +28,23 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Flutter
-        uses: subosito/flutter-action@v2
+        run: |
-        with:
+          # Direct Flutter SDK download — subosito/flutter-action queries
-          flutter-version: ${{ env.FLUTTER_VERSION }}
+          # GitHub internal APIs that are unavailable on self-hosted Gitea runners.
-          cache: true
+          if [ "$(uname)" = "Darwin" ]; then
+            PLATFORM="macos"
+            ARCH="darwin-x64"
+          else
+            PLATFORM="linux"
+            ARCH="linux-x64"
+          fi
+          curl -fsSL "https://storage.googleapis.com/download.flutter.io/flutter_${ARCH}-stable.tar.xz" \
+            -o flutter.tar.xz
+          tar -xf flutter.tar.xz
+          export PATH="$PWD/flutter/bin:$PATH"
+          flutter --version
+          # Persist for subsequent steps (Gitea Actions / act compatibility)
+          echo "$PWD/flutter/bin" >> "$GITHUB_PATH" || echo "$PWD/flutter/bin" >> "$HOME/.env_path"
 
       - name: Install dependencies
         run: flutter pub get
@@ -57,10 +70,18 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Flutter
-        uses: subosito/flutter-action@v2
+        run: |
-        with:
+          if [ "$(uname)" = "Darwin" ]; then
-          flutter-version: ${{ env.FLUTTER_VERSION }}
+            ARCH="darwin-x64"
-          cache: true
+          else
+            ARCH="linux-x64"
+          fi
+          curl -fsSL "https://storage.googleapis.com/download.flutter.io/flutter_${ARCH}-stable.tar.xz" \
+            -o flutter.tar.xz
+          tar -xf flutter.tar.xz
+          export PATH="$PWD/flutter/bin:$PATH"
+          flutter --version
+          echo "$PWD/flutter/bin" >> "$GITHUB_PATH" || echo "$PWD/flutter/bin" >> "$HOME/.env_path"
 
       - name: Install dependencies
         run: flutter pub get
@@ -92,17 +113,26 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Java 17
-        uses: actions/setup-java@v4
+        run: |
-        with:
+          # Direct Temurin JDK download — actions/setup-java queries GitHub APIs
-          distribution: temurin
+          curl -fsSL "https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.12%2B7/OpenJDK17U-jdk_x64_linux_hotspot_17.0.12_7.tar.gz" \
-          java-version: "17"
+            -o jdk.tar.gz
-          cache: gradle
+          mkdir -p "$HOME/jdk"
+          tar -xzf jdk.tar.gz -C "$HOME/jdk" --strip-components=1
+          export JAVA_HOME="$HOME/jdk"
+          export PATH="$JAVA_HOME/bin:$PATH"
+          java -version
+          echo "JAVA_HOME=$JAVA_HOME" >> "$GITHUB_ENV" || export JAVA_HOME="$JAVA_HOME"
+          echo "$JAVA_HOME/bin" >> "$GITHUB_PATH" || export PATH="$JAVA_HOME/bin:$PATH"
 
       - name: Setup Flutter
-        uses: subosito/flutter-action@v2
+        run: |
-        with:
+          curl -fsSL "https://storage.googleapis.com/download.flutter.io/flutter_linux-x64-stable.tar.xz" \
-          flutter-version: ${{ env.FLUTTER_VERSION }}
+            -o flutter.tar.xz
-          cache: true
+          tar -xf flutter.tar.xz
+          export PATH="$PWD/flutter/bin:$PATH"
+          flutter --version
+          echo "$PWD/flutter/bin" >> "$GITHUB_PATH" || echo "$PWD/flutter/bin" >> "$HOME/.env_path"
 
       - name: Install Android SDK command-line tools
         run: |
@@ -114,7 +144,6 @@ jobs:
           export PATH="${ANDROID_HOME}/cmdline-tools/latest/bin:${PATH}"
           yes | sdkmanager --licenses >/dev/null 2>&1 || true
           sdkmanager "platform-tools" "platforms;android-35" "build-tools;35.0.0"
-          # Gitea Actions: set env vars for subsequent steps in same job
           echo "ANDROID_HOME=${ANDROID_HOME}" >> "$GITHUB_ENV" || echo "ANDROID_HOME=${ANDROID_HOME}" >> "$HOME/.env"
           echo "${ANDROID_HOME}/cmdline-tools/latest/bin" >> "$GITHUB_PATH" || export PATH="${ANDROID_HOME}/cmdline-tools/latest/bin:${PATH}"
           echo "${ANDROID_HOME}/platform-tools" >> "$GITHUB_PATH" || export PATH="${ANDROID_HOME}/platform-tools:${PATH}"
@@ -126,15 +155,17 @@ jobs:
         run: |
           yes | sdkmanager --licenses || true
 
-      - name: Setup Python (for whitelabel build script)
-        uses: actions/setup-python@v5
-        with:
-          python-version: "3.12"
-
       - name: Install Python dependencies
         run: |
-          python -m pip install --upgrade pip
+          # Use system Python — actions/setup-python queries GitHub APIs
-          pip install -r requirements.txt
+          if command -v python3 &>/dev/null; then
+            python3 -m pip install --upgrade pip 2>/dev/null || true
+            if [ -f requirements.txt ]; then
+              python3 -m pip install -r requirements.txt
+            fi
+          else
+            echo "WARNING: Python3 not found, skipping pip install"
+          fi
 
       - name: Install dependencies
         run: flutter pub get
@@ -208,10 +239,14 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Flutter
-        uses: subosito/flutter-action@v2
+        run: |
-        with:
+          # macOS-specific Flutter download
-          flutter-version: ${{ env.FLUTTER_VERSION }}
+          curl -fsSL "https://storage.googleapis.com/download.flutter.io/flutter_darwin-x64-stable.tar.xz" \
-          cache: true
+            -o flutter.tar.xz
+          tar -xf flutter.tar.xz
+          export PATH="$PWD/flutter/bin:$PATH"
+          flutter --version
+          echo "$PWD/flutter/bin" >> "$GITHUB_PATH" || echo "$PWD/flutter/bin" >> "$HOME/.env_path"
 
       - name: Install dependencies
         run: flutter pub get