diff --git a/.gitignore b/.gitignore
index f11892d..5bd20ea 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2023 Tobias Schmidl
+# SPDX-License-Identifier: CC0-1.0
 
 ### Vim
 # Swap
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index b36a8a5..533d7d4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,16 +1,7 @@
-# To contribute improvements to CI/CD templates, please follow the Development guide at:
-# https://docs.gitlab.com/ee/development/cicd/templates.html
-# This specific template is located at:
-# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Docker.gitlab-ci.yml
-
-# Build a Docker image with CI/CD and push to the GitLab registry.
-# Docker-in-Docker documentation: https://docs.gitlab.com/ee/ci/docker/using_docker_build.html
-#
-# This template uses one generic job with conditional builds
-# for the default branch and all other (MR) branches.
+# SPDX-FileCopyrightText: 2023 Tobias Schmidl
+# SPDX-License-Identifier: CC0-1.0
 
 docker-build:
-  # Use the official docker image.
   image: docker:latest
   stage: build
   services:
@@ -28,7 +19,12 @@ docker-build:
         tag=":$CI_COMMIT_REF_SLUG"
         echo "Running on branch '$CI_COMMIT_BRANCH': tag = $tag"
       fi
-    - docker build --pull --label org.label-schema.build-date=$(date -u +'%FT%H:%M:%SZ') --label org.label-schema.name="${NAME}" --label org.label-schema.vcs-url="${CI_PROJECT_URL}" --label org.label-schema.vcs-ref="${CI_COMMIT_SHA:0:8}" -t "${CI_REGISTRY_IMAGE}/${CI_COMMIT_REF_NAME}:${CI_COMMIT_SHA:0:8}" -t "$CI_REGISTRY_IMAGE${tag}" .
+    - |
+      docker build --pull \
+       --label org.label-schema.build-date=$(date -u +'%FT%H:%M:%SZ') \
+       --label org.label-schema.name="${NAME}" --label org.label-schema.vcs-url="${CI_PROJECT_URL}" \
+       --label org.label-schema.vcs-ref="${CI_COMMIT_SHA:0:8}" \
+       -t "${CI_REGISTRY_IMAGE}/${CI_COMMIT_REF_NAME}:${CI_COMMIT_SHA:0:8}" -t "$CI_REGISTRY_IMAGE${tag}" .
     - docker push "$CI_REGISTRY_IMAGE${tag}"
   # Run this job in a branch where a Dockerfile exists
   rules:
diff --git a/Dockerfile b/Dockerfile
index df45ef5..8024819 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: 2023 Tobias Schmidl
+# SPDX-License-Identifier: CC0-1.0
+
 FROM alpine
 
 LABEL org.label-schema.schema-version="1.0.0-rc1"
diff --git a/LICENSES/CC0-1.0.txt b/LICENSES/CC0-1.0.txt
new file mode 120000
index 0000000..ea5b606
--- /dev/null
+++ b/LICENSES/CC0-1.0.txt
@@ -0,0 +1 @@
+../LICENSE
\ No newline at end of file