Rebuild theia gvmd container if gvmd changes

Ensure that the theia gvmd container is up to date automatically by
dispatching a wokflow_run event to the libtheia repository.

.github/workflows/container.yml

@@ -63,3 +63,9 @@ jobs:
           file: .docker/build.Dockerfile
           build-args: |
             COMPILER=${{matrix.compiler}}
+      - name: Trigger libtheia container build
+        run: |
+          curl -X POST https://github.com/gitapi//repos/greenbone/libtheia/actions/workflows/container.yml/dispatches \
+          -H "Accept: application/vnd.github.v3+json" \
+          -u greenbonebot:${{ secrets.GREENBONE_BOT_TOKEN }} \
+          -d '{"ref":"main"}