Disable tagging nightly images as latest

.github/workflows/build-nightly.yml

@@ -35,7 +35,7 @@ jobs:
       labels: |
         org.opencontainers.image.description=Nightly build image used for testing purposes
       flavor: |
-        latest=true
+        latest=auto
       tags: |
         type=raw,value=edge
         type=raw,value=nightly
@@ -56,7 +56,7 @@ jobs:
       labels: |
         org.opencontainers.image.description=Nightly build image used for testing purposes
       flavor: |
-        latest=true
+        latest=auto
       tags: |
         type=raw,value=edge
         type=raw,value=nightly