diff --git a/.gitea/workflows/cicd.yaml b/.gitea/workflows/cicd.yaml
index 49ffb81..bf20986 100644
--- a/.gitea/workflows/cicd.yaml
+++ b/.gitea/workflows/cicd.yaml
@@ -11,12 +11,7 @@ jobs:
     steps:
     - name: pull
       run: |
-        was=$(docker images | grep registry-app.inhome.blapointe.com:5001/docker:latest | awk '{print $3}')
         docker pull registry-app.inhome.blapointe.com:5001/docker:latest
-        new=$(docker images | grep registry-app.inhome.blapointe.com:5001/docker:latest | awk '{print $3}')
-        if [ "$was" != "$new" ]; then
-          docker rmi "$was"
-        fi
       shell: sh
   cicd:
     name: cicd
@@ -24,20 +19,11 @@ jobs:
     steps:
     - name: cicd
       run: |
-        was=$(docker images | grep registry-app.inhome.blapointe.com:5001/docker:latest | awk '{print $3}')
-
         pwd
         ls
         find . -type d
         ps aux www
-        echo clone ${{ gitea.repository }}
-        git clone ${{ gitea.repository }}
-        cd ./*/
+        which git
         if ! sh ./build.sh; then
           exit 1
         fi
-
-        new=$(docker images | grep registry-app.inhome.blapointe.com:5001/docker:latest | awk '{print $3}')
-        if [ "$was" != "$new" ]; then
-          docker rmi "$was"
-        fi
diff --git a/build.sh b/build.sh
index 63df4ac..f85ac76 100644
--- a/build.sh
+++ b/build.sh
@@ -2,9 +2,18 @@
 
 img=registry-app.inhome.blapointe.com:5001/docker
 t=latest
-docker rmi $img:$t
 
 set -e
 
+get_sha() {
+   docker inspect $img:$t | grep '"Id"' | awk '{print $NF}' | sed 's/^"sha256://' | sed 's/",$//'
+}
+
+was=$(get_sha)
 docker build -f ./Dockerfile -t $img:$t --progress plain .
 docker push $img:$t
+now=$(get_sha)
+if [ -n "$was" ] && [ "$was" != "$now" ]; then
+   echo pruning old $was
+   docker rmi "$was"
+fi