test/integration: Fix cleanups when the test fails

The script runs with `set -e`. Thus, if the actual test fails, the cleanups
are not run.

This wouldn't be normally an issue, because we run in an ephemeral
environment, but one of the scripts (run-openid.sh) runs a command in
background. This is unfortunately a nemesis of our CI setup: GitLab
keeps running any jobs until their timeout if they have a hanging process
in the background. By ensuring that the cleanup scripts are run properly,
the process should get killed, and the job will be able to fail gracefully.

test/integration.sh

@@ -23,6 +23,27 @@ sudo dnf -y \
      download \
      "koji-osbuild*"
 
+function cleanup() {
+    echo "== Script execution stopped or finished - Cleaning up =="
+
+    # Clean up as many things as possible
+    set +e
+
+    greenprint "Stopping koji builder"
+    sudo /usr/libexec/koji-osbuild-tests/run-builder.sh stop /usr/share/koji-osbuild-tests
+
+    greenprint "Stopping containers"
+    sudo /usr/libexec/koji-osbuild-tests/run-koji-container.sh stop
+
+    greenprint "Stopping mock OpenID server"
+    sudo /usr/libexec/koji-osbuild-tests/run-openid.sh stop
+
+    greenprint "Removing generated CA cert"
+    sudo rm /etc/pki/ca-trust/source/anchors/osbuild-ca-crt.pem
+    sudo update-ca-trust
+}
+trap cleanup EXIT
+
 greenprint "Creating composer SSL certificates"
 sudo /usr/libexec/koji-osbuild-tests/make-certs.sh /usr/share/koji-osbuild-tests
 
@@ -67,16 +88,3 @@ greenprint "Running integration tests"
 AWS_ACCESS_KEY_ID="${V2_AWS_ACCESS_KEY_ID:-}" \
 AWS_SECRET_ACCESS_KEY="${V2_AWS_SECRET_ACCESS_KEY:-}" \
 python3 -m unittest discover -v /usr/libexec/koji-osbuild-tests/integration/
-
-greenprint "Stopping koji builder"
-sudo /usr/libexec/koji-osbuild-tests/run-builder.sh stop /usr/share/koji-osbuild-tests
-
-greenprint "Stopping containers"
-sudo /usr/libexec/koji-osbuild-tests/run-koji-container.sh stop
-
-greenprint "Stopping mock OpenID server"
-sudo /usr/libexec/koji-osbuild-tests/run-openid.sh stop
-
-greenprint "Removing generated CA cert"
-sudo rm /etc/pki/ca-trust/source/anchors/osbuild-ca-crt.pem
-sudo update-ca-trust