feat(docker): Add CMAKE_FRESH_PRESET arg for --fresh cmake config (#151)

Adds a CMAKE_FRESH_PRESET build argument to the Dockerfile.
When set to a non-empty value (e.g., 'true'), this appends
'--fresh' to the initial 'cmake --preset' command, helping to
resolve potential CMake cache issues during the Docker build.

Updated README.md with explanation and usage example.

Author: Urfoex

src/engine/Dockerfile

@@ -107,6 +107,7 @@ ENV GETML_VERSION=$VERSION
 ARG ENGINE_PRESET="release"
 ARG ENGINE_REPO_SOURCE
 ARG ENGINE_DIR
+ARG CMAKE_FRESH_PRESET=""
 ENV ENGINE_BUILD_PATH="$ENGINE_DIR/build/release-build"
 
 COPY $ENGINE_REPO_SOURCE $ENGINE_DIR
@@ -119,7 +120,7 @@ RUN --mount=type=cache,target=$CCACHE_PATH,id="$CCACHE_PATH-$CACHE_ID" \
     if [ -n "$NJOBS" ]; then export CMAKE_BUILD_PARALLEL_LEVEL="$NJOBS"; fi \
     && source scl_source enable gcc-toolset-14 \
     && ccache --zero-stats \
-    && cmake --preset ${ENGINE_PRESET} -D CMAKE_UNITY_BUILD=ON -D CMAKE_UNITY_BUILD_BATCH_SIZE=0 \
+    && cmake --preset ${ENGINE_PRESET} -D CMAKE_UNITY_BUILD=ON -D CMAKE_UNITY_BUILD_BATCH_SIZE=0 ${CMAKE_FRESH_PRESET:+ --fresh} \
     && cmake --build --preset ${ENGINE_PRESET} \
     && ccache --show-stats -v -v
 

src/engine/README.md

@@ -285,6 +285,18 @@ $ docker build \
   .
 ```
 
+Sometimes the cmake cache is not updated correctly. In that case, use the `CMAKE_FRESH_PRESET` flag to force a fresh preset.
+
+```bash
+$ docker build \
+  -f Dockerfile \
+  --target package \
+  --build-arg VERSION=1.5.0 \
+  --build-arg CMAKE_FRESH_PRESET=true \
+  --output type=local,dest=$(pwd)/build-docker \
+  .
+```
+
 
 ### Quick check of Docker built engine