Moves readmes to separate folder docs

docs/developer-push-policy.md

@@ -196,11 +196,39 @@ clang-format -i main.cpp tests/test_main.cpp
 python3 ci/check_pr_policies.py
 ```
 
-### Projekt lokal bauen
+## Projekt lokal im CI-Container bauen
+
+Zuerst das lokale CI-Image bauen:
+
 ```bash
-cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug
-cmake --build build --parallel
-ctest --test-dir build --output-on-failure
+docker build -t lifemaps/ci-cpp:latest -f Dockerfile.ci .
+```
+
+Danach das Projekt im Container bauen und testen:
+
+```bash
+docker run --rm -it \
+  -v "$PWD:/workspace" \
+  -w /workspace \
+  lifemaps/ci-cpp:latest \
+  bash -lc '
+    cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug &&
+    cmake --build build --parallel &&
+    ctest --test-dir build --output-on-failure
+  '
+```
+
+Damit wird dieselbe Toolchain verwendet wie in der Jenkins-CI.
+
+
+## Policy-Check lokal im CI-Container ausführen
+
+```bash
+docker run --rm -it \
+  -v "$PWD:/workspace" \
+  -w /workspace \
+  lifemaps/ci-cpp:latest \
+  bash -lc 'python3 ci/check_pr_policies.py'
 ```
 
 ---