diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index da60c89b03276841c63379d793a4325d7424e6c9..dd52b10ad72d6a73dd1967f0e88cd08ca964d9f8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -52,6 +52,7 @@ test:ant:
         - echo junit.home=/usr/share/java >> override.properties
         - echo hamcrest.home=/usr/share/java >> override.properties
         - echo mockito.home=/usr/share/java >> override.properties
+        - echo build.built-by=GitHub Actions >> override.properties
     script:
         - ant test
     only:
diff --git a/Dockerfile b/Dockerfile
index 1c00f1bb22b55cee756a35606ea97ef891237824..d7834e94645296e96f754bd1fc3d3f2fc72c90ae 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,7 @@ WORKDIR /tmp/build
 COPY . .
 
 RUN add-pkg --virtual build-base gettext tar bzip2 apache-ant openjdk17 \
+    && echo "build.built-by=Docker" >> override.properties \
     && ant preppkg-linux-only \
     && rm -rf pkg-temp/osid pkg-temp/lib/wrapper pkg-temp/lib/wrapper.* \
     && del-pkg build-base gettext tar bzip2 apache-ant openjdk17