fix alpine docker image tag

Signed-off-by: Markus Blaschke <mblaschke82@gmail.com>

Author: mblaschke

.github/workflows/build-docker.yaml

@@ -38,7 +38,7 @@ jobs:
 
           - Dockerfile: Dockerfile
             target: "final-alpine"
-            suffix: ""
+            suffix: "-alpine"
             latest: false
 
           - Dockerfile: Dockerfile