feat(koolbox): Switch to calver

images/koolbox/.release

-release=0.5.1

images/koolbox/Earthfile

@@ -75,8 +75,6 @@ container-internal:
 container:
     FROM ../mirror+alpine
     ARG registry=quay.io/shivering-isles/koolbox
-    COPY .release ./
-    ARG tag=$(awk -F'=' '$1 == "release" {print $2}' .release)
     ARG latest=false
     IF [ $latest = "true" ]
         FROM +container-internal
@@ -85,7 +83,8 @@ container:
         FROM +container-internal
         LABEL "quay.expires-after"="12w"
     END
-    SAVE IMAGE --push ${registry}:${tag}
+    SAVE IMAGE --push ${registry}:$(date +%Y.%m)
+    SAVE IMAGE --push ${registry}:$(date +%Y.%m.%d)
 
 install:
     BUILD +container --latest=true