build and develop using docker

- add DevContainer
  note that integration tests will not run in devcontainer
- allow to build using docker buildx bake

Signed-off-by: Falk Werner <falk.werner@gmx.net>

Dockerfile

@@ -0,0 +1,47 @@
+FROM ubuntu:22.04 as builder
+
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt update && apt install -y --no-install-recommends \
+    locales \
+    ca-certificates \
+    git \
+    build-essential \
+    pkg-config \
+    cmake \
+    libfuse3-dev \
+    libwebsockets-dev \
+    libgtest-dev \
+    libgmock-dev \
+    clang-tidy \
+    valgrind
+
+FROM builder as devcontainer
+
+RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
+ENV LANG en_US.UTF-8  
+ENV LANGUAGE en_US:en  
+ENV LC_ALL en_US.UTF-8
+
+ARG USERNAME=user
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+RUN groupadd --gid $USER_GID $USERNAME
+RUN useradd --uid $USER_UID --gid $USER_GID -m $USERNAME
+
+FROM builder as buildrun
+
+COPY . /src/webfuse
+# workaround:
+#   remote build directory, since --exclude is not available yet
+#   .dockerignore is not suitable since we want build directory be present in DevContainer
+RUN rm -rf /src/webfuse/build
+
+WORKDIR /src/webfuse
+RUN cmake -B build -DCMAKE_BUILD_TYPE=Release -DWITHOUT_TEST=ON -DWITHOUT_CLANG_TIDY=ON
+RUN cmake --build build
+RUN DESTDIR=out cmake --install build
+
+FROM scratch as build
+
+COPY --from=buildrun /src/webfuse/out /