Don't compile openssl in CI

On debian there are well defined valgrind ignores. This means that we
can say that openssl is pure and we don't need our own version.
Also add static analyzers to CI.
7 jobs for master in 5 minutes and 53 seconds (queued for 23 seconds)
Status Job ID Name Coverage
  Test
passed #114264
cppcheck

00:00:22

passed #114265
luacheck

00:00:21

passed #114262
system-tests

00:02:11

passed #114263
system-valgrind-tests

00:03:16

passed #114260
unit-tests

00:01:58

passed #114261
unit-valgrind-tests

00:02:50

 
  Pages
failed #114266
pages

00:02:36

 
Name Stage Failure
failed
pages Pages
Processing file tests/lunit-launch/main.c
Processing file /usr/include/x86_64-linux-gnu/curl/typecheck-gcc.h
Writing directory view page.
Overall coverage rate:
lines......: 80.5% (11416 of 14176 lines)
functions..: 72.0% (350 of 486 functions)
$ markdown .doc_index.md > public/index.html
/bin/bash: line 67: markdown: command not found
ERROR: Job failed: exit code 1