Update dockerbuild, use Tag if a tag was pushed, latest otherwise

.gitea/workflows/cicd.yaml

@@ -1,7 +1,7 @@
 name: Build Deploy email notification tool
 run-name: ${{ gitea.actor }} building new version of the email notification tool
 on:
-  push:
+  push:  # Baut bei jedem Push (Branches + Tags)
   workflow_dispatch:
 
 jobs:
@@ -10,9 +10,20 @@ jobs:
     steps:
       - name: Check out repository code
         uses: actions/checkout@v3
+
       - name: Login to Docker Registry
         run: podman login -u ${{ secrets.REGISTRY_USERNAME }} -p ${{ secrets.REGISTRY_TOKEN }} cr.ortlerstrasse.de
+
+      - name: Set Docker Image Tag
+        run: |
+          if [[ "${{ gitea.ref }}" == refs/tags/* ]]; then
+            echo "TAG_NAME=${{ gitea.ref_name }}" >> $GITHUB_ENV
+          else
+            echo "TAG_NAME=latest" >> $GITHUB_ENV
+          fi
+
       - name: Build Docker image
-        run: podman build -t cr.ortlerstrasse.de/cgo/pretix:latest .
+        run: podman build -t cr.ortlerstrasse.de/cgo/pretix:${{ env.TAG_NAME }} .
+
       - name: Push Docker image
-        run: podman push cr.ortlerstrasse.de/cgo/pretix:latest
+        run: podman push cr.ortlerstrasse.de/cgo/pretix:${{ env.TAG_NAME }}