Change references from master to main.

Author: Potherca

Dockerfile

@@ -46,7 +46,7 @@ LABEL \
     org.label-schema.name="Shellcheck" \
     org.label-schema.schema-version="1.0" \
     org.label-schema.url="https://pipeline-components.gitlab.io/" \
-    org.label-schema.usage="https://gitlab.com/pipeline-components/shellcheck/blob/master/README.md" \
+    org.label-schema.usage="https://gitlab.com/pipeline-components/shellcheck/blob/main/README.md" \
     org.label-schema.vcs-ref=${BUILD_REF} \
     org.label-schema.vcs-url="https://gitlab.com/pipeline-components/shellcheck/" \
     org.label-schema.vendor="Pipeline Components"

README.md

@@ -98,14 +98,14 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
-[commits]: https://gitlab.com/pipeline-components/shellcheck/-/commits/master
-[contributors]: https://gitlab.com/pipeline-components/shellcheck/-/graphs/master
+[commits]: https://gitlab.com/pipeline-components/shellcheck/-/commits/main
+[contributors]: https://gitlab.com/pipeline-components/shellcheck/-/graphs/main
 [dockerhub]: https://hub.docker.com/r/pipelinecomponents/shellcheck
 [license-shield]: https://img.shields.io/badge/License-MIT-green.svg
 [mjrider]: https://gitlab.com/mjrider
 [discord]: https://discord.gg/vhxWFfP
 [gitlabci-shield]: https://img.shields.io/gitlab/pipeline/pipeline-components/shellcheck.svg
-[gitlabci]: https://gitlab.com/pipeline-components/shellcheck/-/commits/master
+[gitlabci]: https://gitlab.com/pipeline-components/shellcheck/-/commits/main
 [issue]: https://gitlab.com/pipeline-components/shellcheck/issues
 [keepchangelog]: http://keepachangelog.com/en/1.0.0/
 [maintenance-shield]: https://img.shields.io/maintenance/yes/2025.svg