add badge test action

.github/workflows/build.yml

@@ -187,3 +187,21 @@ jobs:
             artifacts/*.zip, artifacts/*.bin
         env:
           GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}
+
+  badges-test:
+    name: Create bagdge test
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Get openDTU core release
+        run: |
+          echo "OPEN_DTU_CORE_RELEASE=$(git for-each-ref --sort=creatordate --format '%(refname) %(creatordate)' refs/tags | grep 'refs/tags/v' | tail -1 | sed 's#.*/##' | sed 's/ .*//')" >> $GITHUB_ENV
+
+      - name: Create openDTU-core-release-Badge
+        uses: schneegans/dynamic-badges-action@v1.7.0
+        with:
+          auth: ${{ secrets.GIST_SECRET }}
+          gistID: 856dda48c1cadac6ea495213340c612b
+          filename: openDTUcoreRelease.json
+          label: based on original OpenDTU
+          message: ${{ env.OPEN_DTU_CORE_RELEASE }}
+          color: lightblue