Merge pull request #41027 from thaJeztah/19.03_bump_criu

[19.03 backport] Dockerfile: bump CRIU 3.14
diff --git a/Dockerfile b/Dockerfile
index c0842f8..1c966bf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -51,7 +51,7 @@
     && rm -rf /var/lib/apt/lists/*
 
 # Install CRIU for checkpoint/restore support
-ENV CRIU_VERSION 3.13
+ARG CRIU_VERSION=3.14
 RUN mkdir -p /usr/src/criu \
     && curl -sSL https://github.com/checkpoint-restore/criu/archive/v${CRIU_VERSION}.tar.gz | tar -C /usr/src/criu/ -xz --strip-components=1 \
     && cd /usr/src/criu \