Docker slim: wait 20s before probing

Change-Id: Ia2d3eb7defc5fef8c6702dd6ad2b9d2b1b4a27f9
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7393e41..a8716bf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -131,7 +131,7 @@
     - wget https://github.com/slimtoolkit/slim/releases/latest/download/dist_linux.tar.gz
     - tar zxf dist_linux.tar.gz
     - export PATH=$(pwd)/dist_linux:$PATH
-    - docker run --rm -v /var/run/docker.sock:/var/run/docker.sock dslim/slim build --include-path /sbin --include-path /usr/local/share/perl5 --env MOJO_CONFIG=/derekovecs/example-models/example-docker.conf --http-probe=true  --tag idscorpuslinguistics/derekovecs:tmp idscorpuslinguistics/derekovecs:$VID-large
+    - docker run --rm -v /var/run/docker.sock:/var/run/docker.sock dslim/slim build --http-probe-start-wait 20 --include-path /sbin --include-path /usr/local/share/perl5 --env MOJO_CONFIG=/derekovecs/example-models/example-docker.conf --http-probe=true  --tag idscorpuslinguistics/derekovecs:tmp idscorpuslinguistics/derekovecs:$VID-large
     - docker build -f Dockerfile.remove-example-data --tag idscorpuslinguistics/derekovecs:latest --tag idscorpuslinguistics/derekovecs:$VID .
     - docker save idscorpuslinguistics/derekovecs:$VID | xz -T0 -M16G -9 > derekovecs.tar.xz
   artifacts: