refactor: Simplify git clone command

Author: mferon

Dockerfile

@@ -17,7 +17,7 @@ RUN apt-get update && apt-get upgrade -y && apt-get install -y \
 
 WORKDIR /opencve
 
-RUN git clone "${OPENCVE_REPOSITORY}" . && git checkout tags/v${OPENCVE_VERSION} -b ${OPENCVE_VERSION}
+RUN git clone --depth 1 -b v${OPENCVE_VERSION} "${OPENCVE_REPOSITORY}" .
 
 WORKDIR /app