docker: add python3-virtualenv

docker/DockerfileDeps

@@ -10,7 +10,7 @@ RUN apt-get update && apt-get install -y \
 RUN apt-get update && apt-get install -y \
         build-essential pkg-config cmake git wget \
         libtool autotools-dev autoconf \
-        cython3 python3-dev python3-setuptools python3-build \
+        cython3 python3-dev python3-setuptools python3-build python3-virtualenv \
         libncurses5-dev libreadline-dev nettle-dev libcppunit-dev \
         libgnutls28-dev libuv1-dev libjsoncpp-dev libargon2-dev \
         libssl-dev libfmt-dev libhttp-parser-dev libasio-dev libmsgpack-dev \

docker/DockerfileDepsLlvm

@@ -11,7 +11,7 @@ RUN apt-get update \
     && apt-get install -y llvm llvm-dev lldb clang gdb make cmake pkg-config \
        libtool git wget libncurses5-dev libreadline-dev \
        nettle-dev libgnutls28-dev libuv1-dev libmsgpack-dev libjsoncpp-dev cython3 python3-dev \
-       python3-setuptools libcppunit-dev python3-pip python3-build \
+       python3-setuptools libcppunit-dev python3-pip python3-build python3-virtualenv \
        autotools-dev autoconf libssl-dev libargon2-dev \
        libfmt-dev libhttp-parser-dev libasio-dev \
     && apt-get remove -y gcc g++ && apt-get autoremove -y \