change docker to install crow directly.

Dockerfile

@@ -9,12 +9,13 @@ RUN apt-get update && \
     apt-get install -y cmake g++ make wget zlib1g-dev && \
     apt-get clean;
 
+# Download Crow library
+RUN wget https://github.com/CrowCpp/Crow/releases/download/v1.2.1.2/Crow-1.2.1-Linux.deb && \
+    apt-get install -y ./Crow-1.2.1-Linux.deb
+
 # Copy the current directory contents into the container at /app
 COPY . /server
 
-# Download Crow library
-RUN apt-get install -y ./lib/crow-1.2.1.deb
-
 # Make the build directory
 RUN mkdir -p build && cd build