travis-ci: Use a non-ostree-specific name for the Docker image

This reduces the diff when comparing these scripts with similar glue
in dbus or elsewhere.

Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>

Closes: #600
Approved by: cgwalters

tests/ci-build.sh

@@ -40,7 +40,7 @@ if [ -n "$ci_docker" ]; then
         --env=ci_test="${ci_test}" \
         --env=ci_test_fatal="${ci_test_fatal}" \
         --privileged \
-        ostree-ci \
+        ci-image \
         tests/ci-build.sh
 fi
 

tests/ci-install.sh

@@ -43,7 +43,7 @@ if [ -n "$ci_docker" ]; then
         -e "s/@ci_docker@/${ci_docker}/" \
         -e "s/@ci_suite@/${ci_suite}/" \
         < tests/ci-Dockerfile.in > Dockerfile
-    exec docker build -t ostree-ci .
+    exec docker build -t ci-image .
 fi
 
 case "$ci_distro" in