define VCPKG_ROOT variable in environment

Dockerfile_OdbDesignServer

@@ -19,27 +19,29 @@ RUN apt-get update && \
         tar  \
         pkg-config \
          && \
-    rm -rf /var/lib/apt/lists/* 
+    rm -rf /var/lib/apt/lists/*
+
+ENV VCPKG_ROOT=/root/src/github/microsoft/vcpkg
 
 # install vcpkg
 WORKDIR /root/src/github/microsoft
-RUN git clone --depth 1 https://github.com/Microsoft/vcpkg.git
-WORKDIR /root/src/github/microsoft/vcpkg
+RUN git clone https://github.com/Microsoft/vcpkg.git ${VCPKG_ROOT}
+WORKDIR ${VCPKG_ROOT}
 RUN ./bootstrap-vcpkg.sh
 
 # pre-install vcpgk packages BEFORE cmake configure
 RUN mkdir -p /src/OdbDesign
 WORKDIR /src/OdbDesign
 COPY ./vcpkg.json .
-RUN /root/src/github/microsoft/vcpkg/vcpkg install
+RUN ${VCPKG_ROOT}/vcpkg install
 
 # copy source
 COPY . .
 
 # configure & build using presets
 # linux-release
-RUN cmake --preset linux-release -G Ninja
-RUN cmake --build --preset linux-release --target OdbDesignServer
+RUN cmake --preset linux-release
+RUN cmake --build --preset linux-release
 # # linux-debug
 # RUN cmake --preset linux-debug
 # RUN cmake --build --preset linux-debug