Fix security builds not being marked latest

.github/workflows/build-security.yml

@@ -32,7 +32,7 @@ jobs:
       labels: |
         org.opencontainers.image.description=Nightly build image used for testing purposes
       flavor: |
-        latest=auto
+        latest=true
       tags: |
         type=raw,value=edge
         type=raw,value=nightly
@@ -53,7 +53,7 @@ jobs:
       labels: |
         org.opencontainers.image.description=Nightly build image used for testing purposes
       flavor: |
-        latest=auto
+        latest=true
       tags: |
         type=raw,value=edge
         type=raw,value=nightly