change docker-buld.yml to git tags

.gitea/workflows/docker-build.yml

@@ -14,7 +14,7 @@ jobs:
 
       - name: Extract tag name
         id: vars
-        run: echo "RELEASE_TAG=${GITEA_REF##*/}" >> $GITEA_OUTPUT
+        run: echo "RELEASE_TAG=$(git describe --tags --exact-match)" >> $GITEA_OUTPUT
 
       - name: Set up Docker Buildx
         run: docker buildx create --use
@@ -24,6 +24,7 @@ jobs:
 
       - name: Build and tag image
         run: |
+          echo "Using tag: ${{ steps.vars.outputs.RELEASE_TAG }}"
           docker build -t dev.ksite.de/ralf.kirchner/bluemastofeed:${{ steps.vars.outputs.RELEASE_TAG }} .
           docker tag dev.ksite.de/ralf.kirchner/bluemastofeed:${{ steps.vars.outputs.RELEASE_TAG }} dev.ksite.de/ralf.kirchner/bluemastofeed:latest