Ubuntu 19.04 is EOL but keep using it

We cannot move right-away to Ubuntu 20.04 because
* lib syscall_intercept doesn't work with more recent libc
  See issue pmem/syscall_intercept#97.
  Proposed change is not merged yet (though appears to work,
  so we could go to that specific commit)
* scapy operation seems to have issues where an ACK goes out
  automatically before our SYN+ACK response to the incoming SYN.

Also, there are other problems building scapy on 19.10.

Let's differ the move to 20.04 LTS to a later time.

Signed-off-by: David Verbeiren <[email protected]>

Dockerfile

@@ -3,6 +3,12 @@ FROM ubuntu:19.04
 LABEL maintainer="Tessares (contact [email protected])"
 LABEL description="All deps for building & running tests of libconvert"
 
+# Ubuntu 19.04 is EOL
+RUN sed -i -re 's/([a-z]{2}\.)?archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
+
+ARG DEBIAN_FRONTEND=noninteractive
+ENV TZ=Europe/Brussels
+
 RUN apt-get update && apt-get install -y --no-install-recommends \
     build-essential \
     check \