Remove Travis file (#2176)

Signed-off-by: J0WI <J0WI@users.noreply.github.com>

.travis/test-example-dockerfiles.sh

@@ -1,18 +0,0 @@
-#!/usr/bin/env bash
-set -e
-
-image="$1"
-
-cd .examples/dockerfiles
-
-dirs=( */ )
-dirs=( "${dirs[@]%/}" )
-for dir in "${dirs[@]}"; do
-    if [ -d "$dir/$VARIANT" ]; then
-        (
-            cd "$dir/$VARIANT"
-            sed -ri -e 's/^FROM .*/FROM '"$image"'/g' 'Dockerfile'
-            docker build -t "$image-$dir" .
-        )
-    fi
-done