Bauen und Releases ohne lokale Abhaengigkeiten ueber ./build.sh

- build.sh (release, build, test) startet einen temporaeren Runner-Container
  (Python, Git, Docker-CLI), der die Build-Container ueber den Docker-Socket startet
- release.py: Quellexport unter releases/ statt /tmp (Host-Pfade fuer Bind-Mounts),
  Test-Befehl in Docker, Git-Identitaet vorab pruefen, bei Commit-Fehler Versionen zuruecknehmen
- Android-Build-Image enthaelt Platform-Tools fest

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-build/android.Dockerfile

@@ -7,6 +7,6 @@ RUN apt-get update && apt-get install -y --no-install-recommends unzip wget && r
  && unzip -q tools.zip -d $ANDROID_HOME/cmdline-tools && mv $ANDROID_HOME/cmdline-tools/cmdline-tools $ANDROID_HOME/cmdline-tools/latest \
  && rm tools.zip \
  && yes | $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --licenses > /dev/null \
- && $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager "platforms;android-35" "build-tools;35.0.0" > /dev/null
+ && $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager "platforms;android-35" "build-tools;35.0.0" "platform-tools" > /dev/null
 COPY docker-build/build-android.sh /usr/local/bin/build-android.sh
 CMD ["sh", "/usr/local/bin/build-android.sh"]

docker-build/runner.Dockerfile

@@ -0,0 +1,6 @@
+# Temporaerer Steuer-Container fuer ./build.sh: Python + Git + Docker-CLI.
+# Startet die eigentlichen Build-Container ueber den Docker-Socket des Hosts.
+FROM python:3.12-slim-bookworm
+COPY --from=docker:27-cli /usr/local/bin/docker /usr/local/bin/docker
+RUN apt-get update && apt-get install -y --no-install-recommends git && rm -rf /var/lib/apt/lists/* \
+ && git config --system --add safe.directory '*'