Don't try to delete things that don't matter

Dockerfile

 # ---- Stage 0 ----
 # Builds media repo binaries
 FROM golang:1.20-alpine AS builder
-LABEL io.t2bot.mmr.cleanup="true"
 
 # Install build dependencies
 RUN apk add --no-cache git musl-dev dos2unix build-base
@@ -11,6 +10,9 @@ COPY . /opt
 RUN dos2unix ./build.sh ./docker/run.sh && chmod 744 ./build.sh
 RUN ./build.sh
 
+# the label is applied last so we don't pollute the image list with a weird amount of labelled images
+LABEL io.t2bot.mmr.cleanup="true"
+
 # ---- Stage 1 ----
 # Final runtime stage.
 FROM alpine

test/test_internals/deps_mmr.go

@@ -205,8 +205,7 @@ func TeardownMmrCaches() {
 				if _, err = dockerProvider.Client().ImageRemove(context.Background(), imageName, types.ImageRemoveOptions{
 					PruneChildren: true,
 				}); err != nil {
-					log.Printf("Error removing MMR cached build image '%s': %s", imageName, err.Error())
-					log.Println()
+					log.Fatalf("Error removing MMR cached build image '%s': %s", imageName, err.Error())
 				}
 			}
 			if images, err := dockerProvider.Client().ImageList(context.Background(), types.ImageListOptions{All: true}); err != nil {