build: Reorder --cache-from sources

It is unclear how docker handles multiple caches under the hood.
I did find an older comment¹ that if multiple `--cache-from` sources are
provided, it will use the first cache hit for the whole run.

This is my attempt to prioritize the ordering of the sources to use the
tagged images from the ghcr.io registry over the latest images from
docker.io.

¹ moby/moby#26839 (comment)

devel/build

@@ -73,14 +73,14 @@ docker buildx build \
     --builder "$builder" \
     --platform "$platform" \
     --build-arg GIT_REVISION \
-    --cache-from "$BUILDER_IMAGE:latest" \
-    --cache-from "$BUILDER_IMAGE:$tag" \
-    --cache-from "$FINAL_IMAGE:latest" \
-    --cache-from "$FINAL_IMAGE:$tag" \
-    --cache-from "$registry/$BUILDER_IMAGE:latest" \
     --cache-from "$registry/$BUILDER_IMAGE:$tag" \
-    --cache-from "$registry/$FINAL_IMAGE:latest" \
+    --cache-from "$registry/$BUILDER_IMAGE:latest" \
     --cache-from "$registry/$FINAL_IMAGE:$tag" \
+    --cache-from "$registry/$FINAL_IMAGE:latest" \
+    --cache-from "$BUILDER_IMAGE:$tag" \
+    --cache-from "$BUILDER_IMAGE:latest" \
+    --cache-from "$FINAL_IMAGE:$tag" \
+    --cache-from "$FINAL_IMAGE:latest" \
     --cache-to type=inline \
     --tag "$registry/$FINAL_IMAGE:$tag" \
     --push \